Some of the week's top sports moments

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England's Amir Khan, left, crumbles to the mat after receiving a low blow from Luis Collazo, right, in their silver welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. Referee Vic Drakulich is at center. Khan went on to win by unanimous decision. (AP Photo/Isaac Brekken)
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Kurt Busch (41), Joey Logano (22), David Ragan (34) and Michael McDowell (95) collide in Turn 4 during the NASCAR Aaron's 499 Sprint Cup series auto race at Talladega Superspeedway, Sunday, May 4, 2014, in Talladega, Ala. (AP Photo/Skip Williams)
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Home plate umpire Greg Gibson, right, argues with Pittsburgh Pirates first base coach Rick Sofield after a third strike call to end the fourth inning of a baseball game against the Toronto Blue Jays, Sunday, May 4, 2014, in Pittsburgh. Sofield was ejected. (AP Photo/Keith Srakocic)
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Guingamp supporters wave flags and chant slogans in the stands of the Stade de France, before the start of the French Cup final match between Guingamp and Rennes at the Stade de France Stadium, in Saint Denis, North of Paris, Saturday, May 3, 2014. (AP Photo/Remy de la Mauviniere)
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Serap Ozcelik, right, of Turkey, and Austria's Bettina Plank in action during the women's Kumite -50 kg competition, at the Karate European Championship, Saturday, May 3, 2014, in Tampere, Finland. Ozcelik won the gold medal. (AP Photo/TT News Agency, Aleksi Tuomola)
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Montreal Canadiens defenseman Francis Bouillon jumps with defenseman P.K. Subban (76) to celebrate his goal as Boston Bruins center David Krejci, right, skates away during the third period in Game 1 of an NHL hockey second-round playoff series in Boston, Thursday, May 1, 2014. (AP Photo/Elise Amendola)
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A horse gets a bath after a morning workout at Churchill Downs, Thursday, May 1, 2014, in Louisville, Ky. (AP Photo/Charlie Riedel)
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Xu Xin of China plays against Zolt Pete of Serbia during their round robin match of the World Team Table Tennis Championships in Tokyo, Thursday, May 1, 2014. (AP Photo/Koji Sasahara)
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Pittsburgh Pirates' Starling Marte, left, scores ahead of the tag by San Francisco Giants catcher Buster Posey in the ninth inning of a baseball game in Pittsburgh, Tuesday, May 6, 2014. Marte was called out initially by home plate umpire Quinn Wolcott, but the call was overturned upon review. It was a walk-off triple, and an error, that allowed Marte to score. The Pirates won 2-1. (AP Photo/Gene J. Puskar)
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Portland Trail Blazers' Robin Lopez (42) and Nicolas Batum (88) battle with San Antonio Spurs' Tim Duncan (21) for a rebound during the first half of Game 1 of a Western Conference semifinal NBA basketball playoff series, Tuesday, May 6, 2014, in San Antonio. (AP Photo/Eric Gay)

Description

Here's a look at some of the defining moments, exciting scenes, triumphs and defeats from the world of sports. Images this week include an umpire battling with a Pittsburgh Pirates first base coach over a call and a boxer crumpled by a low blow in Las Vegas.

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