Here's how the American contingent fared on Day Two of the Australian Open.
It was a good night for American women at the Australian Open as both Williams sisters and Madison Keys progressed into the second round.
In all, there were 13 Americans playing last night, six of whom advanced through the first round.
• Serena Williams started her campaign with a comprehensive victory over Tatjana Maria. Williams only lost two games as she overpowered the 31-year-old German. Her next opponent will be 2014 Wimbledon finalist Eugenie Bouchard.
• Venus Williams, unseeded at a Grand Slam for the first time in five years, defeated No. 25 seed Mihaela Buzarnescu. Buzarnescu won the first set and served for the match at 5-4, but the veteran experience of Venus Williams proved the difference as she prevailed 6-7, 7-6, 7-2 over two-and-a-half hours. Venus will play world No. 1 Simona Halep in the second round.
• Madison Keys cruised past Australian Destanee Aiava 6-2, 6-2.
• Jack Sock's awful run at majors continued with a four-set loss to Australian wild card Alex Bolt. Sock has won one match in his last five Grand Slam appearances, and has already dropped from the top 10 to No. 105 over the last year.
• Bradley Klahn suffered a heartbreaking loss to last year's semifinalist Hyeon Chung. Klahn went up two sets to love via two excellent tiebreaks, but Chung wore down the American and took the next three sets.
• Sofia Kenin, just off the heels of her first WTA title in Auckland, navigated through a tricky first round match against Veronika Kudermetova. Kenin won 7-5 in the third.
• Despite a lacklustre warmup campaign, Ryan Harrison defeated Jiri Vesely in straight sets. Harrison will play Russian up-and-comer Danill Medvedev in the second round.
• Mitchell Krueger played excellently in qualifying, but his reward was a nightmare matchup against No. 1 Novak Djokovic in the first round. Krueger actually broke Djokovic early in the first set and took the lead, but Djokovic proceeded to win in straights. Krueger managed to entertain the crowd by saving 14 break points against Djokovic, which is no easy feat.
• Young American talent Whitney Osuigwe faced the equally talented Canadian Bianca Andreescu in the first round. It was a close match, but Andreescu won the third set 6-3 and continued her impressive start to the 2019 season.
• Sam Querrey lost to Pierre-Hugues Herbert in four sets. Yikes.
• Madison Brengle dominated Misaki Doi 6-4, 6-0.
• Qualifier Bjorn Fratangelo took No. 29 seed Gilles Simon to a tiebreak in the first set, but still lost in straights.
• Varvara Lepchenko lost to Russian qualifier Natalia Vikhlyantseva.