LONDON (AP) The Latest on Wimbledon (all times local):
Roger Federer is back in Grand Slam action - and back to his winning ways.
The owner of seven Wimbledon titles and 17 major championships overall did not exactly have an easy time of things but did beat 52nd-ranked Guido Pella of Argentina 7-6 (5), 7-6 (3), 6-3 on Monday in the first round at the All England Club.
Federer missed the previous Grand Slam tournament, the French Open, withdrawing before it began last month because of a lingering back injury. That ended the 34-year-old Swiss star's record streak of 65 consecutive appearances at majors.
In the second round, Federer will face 772nd-ranked British qualifier Marcus Willis.
A British qualifier ranked 772nd and playing his first tour-level singles match has provided the feel-good story of the day at Wimbledon.
Marcus Willis, a 25-year-old left-hander who has been working as a tennis coach, stunned 54th-ranked Ricardas Berankis of Lithuania 6-3, 6-3, 6-4 in front of a wildly cheering crowd on tiny Court 17 at the All England Club.
When Willis held serve to close out the match, he ran to hug friends and family in the stands.
Willis saved 19 of 20 break points against Berankis, who was playing in his fourth Wimbledon and 15th Grand Slam turnament.
Willis won three matches in a special British Lawn Tennis Association event just to earn a wild card into qualifying for Wimbledon. He then won three all three qualifying matches to make it into the main draw.
Willis and No. 791 Albano Olivetti, who also qualified for the main draw, are the two lowest-ranked players to qualify for the main draw at a Grand Slam since No. 1,122 Mark Knowles at Wimbledon in 1998.
French Open champion Garbine Muguruza was extended to three sets before winning her first-round match at Wimbledon on Monday.
The second-seeded Spaniard beat Camila Giorgi of Italy 6-2, 5-7, 6-4 on Centre Court.
The match was effectively decided in the third game of the final set, which lasted more than 10 minutes and included five deuces and six break points. The game ended with Muguruza breaking for a 2-1 lead when Giorgi hit a forehand into the net.
The players stayed on serve the rest of the way, with Muguruza serving out the match at love.
Muguruza lost in the last year's Wimbledon final to Serena Williams.
Denis Istomin of Uzbekistan ended a five-match losing streak on tour when he outlasted 20th-seeded Kevin Anderson 4-6, 6-7 (13), 6-4, 7-6 (2), 6-3 after more than 3 1/2 hours in the first round of Wimbledon on Monday.
Anderson aced Istomin 28 times, but the South African wasn't as consistently good on serve as Istomin, in a high quality match in which there were only five breaks of serve.
They hit 59 winners each, and Istomin made only 33 unforced errors to Anderson's 38, as he won a first-round match in a Grand Slam for only the second time in two years.
French Open champion Garbine Muguruza is in a battle in her opening-round match at Wimbledon.
The second-seeded Spaniard won the first set 6-2 against Camila Giorgi, but the Italian has won the second set 7-5 to force a decisive third.
Giorgi came into the Centre Court match with a 2-1 lead in career matches against Muguruza, but this is the first time they have played each other on grass.
Sam Querrey came all the way back after losing the first two sets to pull out a 12-10 victory in the fifth and reach the second round at Wimbledon.
The 28th-seeded American ended the match with his 33rd ace, beating Lukas Rosol of the Czech Republic 6-7 (6), 6-7 (5), 6-4, 6-2, 12-10.
Rosol is best known for eliminating Rafael Nadal in the second round at Wimbledon in 2012.
Querrey hasn't been as far as the third round at the All England Club since 2012.
Former No. 1 Ana Ivanovic blamed an injured right wrist for causing her problems during a surprising 6-2, 7-5 loss in Wimbledon's first round against a qualifier ranked 223rd and making her Grand Slam debut.
Ivanovic, the 2008 French Open champion who was seeded 23rd at the All England Club, was beaten by 21-year-old Russian Ekaterina Alexandrova on Monday.
Calling the exit ''disappointing,'' Ivanovic said her wrist had been bothering her for two weeks. She said she plans to take time off and not play until the Rio de Janeiro Olympics in August. Ivanovic thinks there is ''enough time'' for the wrist pain ''to settle down'' so she can represent Serbia at the Summer Games.
Ivanovic was a 2007 semifinalist at Wimbledon but has not made it past the fourth round since then, including second-round exits in 2013 and last year.
Defending champion Novak Djokovic got halfway to the second ''triple bagel'' - 6-0, 6-0, 6-0 - in Wimbledon history before dropping a game, then wasn't quite as perfect the rest of the way in a first-round victory.
Playing Monday's first match on Centre Court, Djokovic won the first nine games and beat 177th-ranked British wild-card entry James Ward 6-0, 7-6 (3), 6-4.
Djokovic has won the past four major tournaments and his titles at the Australian Open in January and French Open this month put him halfway to the first calendar-year Grand Slam since Rod Laver in 1969.
The only 6-0, 6-0, 6-0 at the All England Club came in 1987, when Stefan Edberg beat Stefan Eriksson in the first round.
Five-time champion Venus Williams won her opening match at Wimbledon for the 17th time when she beat Donna Vekic of Croatia 7-6 (3), 6-4.
Vekic, who was 1 year old when Williams made her Wimbledon debut in 1997, had two set points in the first set serving at 6-5 but blew them both on errors. Williams ran through the tiebreaker.
In the second set, Vekic had a break chance for 5-3, but another unforced error squandered it.
Williams broke for 5-4 and served out in her 19th Wimbledon, a record among active players.
''The first set had some hairy moments, down some set points, but that's where experience kicked in ... lots of it,'' Williams said.
Former Wimbledon women's runner-up Sabine Lisicki advanced to the second round with a 6-1, 6-3 victory over Shelby Rogers on the opening day at the All England Club.
Lisicki, the German who lost to Marion Bartoli in the 2013 final, took exactly one hour to beat the 62nd-ranked American.
Lisicki has fallen to No. 81 in the rankings but has a game suited to grass. Rogers has failed to get past the first round at Wimbledon in four appearances.
Vicky Duval was back at Wimbledon on Monday, competing in the grass-court Grand Slam tournament for the first time in two years after recovering from Hodgkin lymphoma.
The 20-year-old, who is based in Bradenton, Florida, lost in the first round to 29th-seeded Daria Kasatkina of Russia 6-0, 7-5. Simply being on court was a symbolic step forward.
At the 2013 U.S. Open, when she was just 17, Duval showed her promise by stunning 2011 champion Sam Stosur in the first round. But a year later, while trying to qualify for Wimbledon, Duval was told she had cancer. She played on, making it to the main draw and then surprisingly beating a seeded player, Sorana Cirstea.
After a yearlong recovery, Duval returned to playing low-level tournaments.
Play is underway at the 130th edition of the Wimbledon tennis championships.
Under cloudy skies, play began on schedule on the outside courts at the All England Club.
Among those in action in early matches are former Grand Slam champions Marin Cilic and Samantha Stosur.
Play on Centre Court and Court 1 was due to start at 1 p.m.
Two-time defending champion men's champion Novak Djokvic was due to open play on Centre against Britain's James Ward, with five-time women's winner Venus Williams up first on Court 1 against Donna Vekic.
Novak Djokovic is ready to open his bid for a third straight Wimbledon title and fifth straight Grand Slam championship.
As tradition dictates, Djokovic has the honor of opening play on Centre Court on Monday as the men's defending champion. He'll face Britain's James Ward, who is ranked 177th in the world and received a wild-card entry.
Djokovic, who holds all four major titles and is halfway to a calendar-year Grand Slam, is bidding for a 13th major championship. Andy Murray, who lost to Djokovic in the Australian Open and French Open finals, is seeded to meet him again in the final here.
Monday's Centre Court schedule also features French Open women's champion Garbine Muguruza against Italy's Camila Giorgi, and seven-time men's winner Roger Federer against Guido Pella of Argentina.