Kevin Durant and the Oklahoma City Thunder assist volunteers and students of Positive Tomorrow at the Regional Food Bank of Oklahoma.
2 of 23David T. Foster, III/Charlotte Observer/MCT/Getty Images
Carolina Panthers quarterback Cam Newton laughs with George Gring, a 6-year-old diagnosed with Burkitt's Lymphoma. The Panthers and the Make-A-Wish Foundation granted George's wish to be a Carolina Panther and to play with Cam Newton.
3 of 23Jack Arent/NBAE via Getty Images
Harrison Barnes of the Golden State Warriors helps refurbish Golden Gate Park along with 350 fans and volunteers, city officials and Warriors front office employees during NBA Green Week.
4 of 23Quique Garecia/AFP/Getty Images
Lionel Messi and Javier Mascherano
Barcelona footballers Lionel Messi and Javier Mascherano give presents to a patient during a charity visit to Sant Pau Hospital in Barcelona.
5 of 23Jeff Swensen/Getty Images
Pittsburgh Pirates pitcher Jason Grilli and his wife volunteer at the Greater Pittsburgh Community Food Bank by serving grilled cheese sandwiches to Pittsburgh area food bank clients.
6 of 23Brian Babineau/NHLI via Getty Images
Jonathan Toews of the Chicago Blackhawks skates with 4-year-old Make-A-Wish guest Nicholas Skretkowski during the NHL Stadium Series family skate at Soldier Field.
7 of 23Layne Murdoch Jr./NBAE via Getty Images
Caron Butler and James Harden
Caron Butler and James Harden help put together a sign at the KIPP Leadership Academy in New Orleans during the NBA Cares All-Star Day of Service.
8 of 23Andrew D. Bernstein/NBAE via Getty Images
Chris Paul of the Los Angeles Clippers works with a child at the Salvation Army Seimon Family Youth and Community Center before unveiling a renovation of the Read To Achieve Learn and Play Center by the Los Angeles Clippers Foundation and the CP3 Foundation.
9 of 23Darren McCollester/Getty Images
Devin McCourty of the New England Patriots hands out prizes during bingo at Boston Children's Hospital.
10 of 23Michael J. Le Brecht II/NBAE via Getty Images
Milwaukee Bucks rookie Jabari Parker, the No. 2 draft pick, leads a cheer with students during a summer NBA Cares clinic.
11 of 23Chris Condon/PGA TOUR
Golfer Jason Dufner participates in a press conference announcing Akron Children's Hospital and University Hospitals Rainbow Babies & Children's Hospital as beneficiaries of the World Golf Championships-Bridgestone Invitational.
12 of 23Garrett W. Ellwood/NBAE via Getty Images
J.J. Hickson of the Denver Nuggets listens to students from North High talk about Black History Month.
13 of 23Tim Boyles/Getty Images
Milwaukee Bucks forward John Henson lifts a young girl for a dunk at the John Henson Experience clinic benefitting Up2Us at the Tampa Bay Youth Sports Expo.
14 of 23Michael LeBrecht/NBAE/Getty Images
J.R. Smith of the New York Knicks participates during the Nickelodeon Worldwide Day of Play Basketball Clinic at Prospect Park, N.Y.
15 of 23Stephen Lovekin/Getty Images
Kyrie Irving hosts a basketball clinic at Oakton High to kick off the 2013 Audi Best Buddies Challenge in Washington, D.C.
16 of 23Michael Dodge/Getty Images
Roger Federer signs autographs for fans after his match against Jo Wilfried Tsonga during the Roger Federer Charity Match, which raised more than $1 million.
17 of 23Richard Rowe/NBAE via Getty Images
Russell Westbrook of the Oklahoma City Thunder hosts his annual Why Not Foundation fundraiser to benefit the Boys and Girls Club.
18 of 23Nathaniel S. Butler/NBAE via Getty Images
USA Men's Basketball Team
Stephen Curry, James Harden, DerMar DeRozan, Rudy Gay, Kenneth Faried and DeMarcus Cousins of the USA Basketball Men's National Team accept the ALS Ice Bucket Challenge.
19 of 23Jeffrey Mayer/WireImage
Los Angeles Clippers point guard Chris Paul and Los Angeles Dodgers pitcher Clayton Kershaw at Kershaw's 2nd Annual Ping Pong 4 Purpose charity event.
20 of 23Bobby Metelus/Getty Images
Dwyane Wade and his sister Tragil attend A Night on the RunWade to benefit Wade's World Foundation.
21 of 23Scott Legato/Getty Images
Detroit Lions running back Reggie Bush poses with $10,000 scholarship winner Bria Gregory and her mother. Bush is a celebrity ambassador for the Taco Bell Foundation for Teens.
22 of 23David Cooper/Getty Images
Derek Jeter accepts a check for $10,000 for his Turn 2 Foundation from Toronto Blue Jays players Mark Buehrle and Jose Bautista.
23 of 23Darren McCollester/Getty Images
Brad Marchand, David Krejci, Tory Krug and Tukka Rask of the Boston Bruins visit the Boston Children's Hospital.
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