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    Boston Celtics head coach Ime Udoka suspended for entire season

    01:38
  • Watch: Man removed from tennis court after setting arm on fire

    00:30
  • Boston Celtics’ coach suspended over alleged affair with staffer

    01:30
  • Boston Celtics suspend coach Ime Udoka for entire season

    01:23
  • Phoenix Suns and Mercury owner says he's selling teams after alleged workplace misconduct

    00:17
  • Lebron James shocks fans with new shaved-head look: See the pic

    01:34
  • Golfers Jordan Spieth, Adam Scott preview the President’s Cup

    02:04
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    02:07
  • EXCLUSIVE: Roger Federer speaks out about retirement

    01:24
  • Roughing the passer? Police investigating allegations fan slapped Cardinals quarterback

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  • Pilot killed when plane crashes during Reno Air Races

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  • Some are spending hundreds or thousands to keep their kids in youth sports

    02:26
  • Michael Jordan’s ‘Last Dance’ jersey sells for a record $10M

    00:37
  • Roger Federer announces retirement from tennis after two decades

    03:19
  • Tennis legend Roger Federer announces his retirement

    02:31
  • Biden to meet with families of Brittney Griner, Paul Whelan

    01:25
  • Brett Favre's newly released texts shed light on role in Mississippi welfare scandal

    02:27
  • Gisele Bündchen opens up about Tom Brady’s ‘un-retirement’

    00:59
  • Phoenix Suns owner suspended for racist, sexist behavior

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  • NBA punishes Phoenix Suns owner Robert Sarver for workplace misconduct

    03:00

How Serena Williams redefined the sport of tennis

06:10

Serena Williams is preparing to step back from tennis as she competes in her final U.S Open. NBC News’ Rehema Ellis reports from Queens, New York about how she refined the sport.