Well, American chair umpire Gregory Allensworth was recently accused of making this mistake in Cincinnati not once but twice.

Players are still chiming in on social media after a likely double-bounce on match point during the pair’s third-round clash went uncalled by chair umpire Greg Allensworth—handing Draper the ...

Chair umpire Greg Allensworth checked on the spectator's well-being before issuing Norrie with a warning for unsportsmanlike conduct.

Novak Djokovic was left stunned and in disbelief over one call made by chair umpire Greg Allensworth as the Serb thought that the umpire missed a blatant hindrance call during his Indian Wells ...

Chair umpire Greg Allensworth checked on the spectator's well-being before issuing Norrie with a warning for unsportsmanlike conduct.

Former world number one Murray was furious with umpire Greg Allensworth as the weather closed in. "I know you guys don't play but it'd be good to have a bit of a feel for what's happening," said ...