A TV commentator has been dropped from coverage of the Australian Open and has apologized for how he spoke about Venus Williams' play in the second round, saying he was describing her aggressive style as "guerrilla" tactics and not comparing her with a "gorilla."

Former tennis pro Doug Adler on Thursday said he was speaking about Williams' tactics and strategy and "simply and inadvertently chose the wrong word to describe her play."

Adler was doing play-by-play commentary on ESPN for Williams' match against Stefanie Voegele, saying Williams was playing more aggressively after Voegele missed serves. After Voegele faulted on a serve, Adler described Venus as moving in and charging with a "gorilla effect" or "guerrilla effect." Because the words gorilla and guerrilla are pronounced similarly, it's impossible to say for certain which word Adler spoke.

In a statement emailed to The Associated Press, ESPN said it had pulled Adler from the broadcasts.

"During an Australian Open stream on ESPN3, Doug Adler should have been more careful in his word selection. He apologized and we have removed him from his remaining assignments," the statement read.

The remark sparked quick reaction on Twitter, with some offended users calling for Adler to be fired for comparing Williams, who is African-American, with a gorilla.

"She puts the Gorilla effect on. Charging". Just wtf. This is not cool <a href="https://twitter.com/ESPNTennis">@ESPNTennis</a> <a href="https://twitter.com/espn">@espn</a> <a href="https://t.co/L46Bwf6sEh">pic.twitter.com/L46Bwf6sEh</a> —@PinaCocoblog

Your move <a href="https://twitter.com/ESPNTennis">@ESPNTennis</a> <a href="https://twitter.com/espn">@espn</a>. That Doug Adler person needs to lose his job for being stupid & racist <a href="https://twitter.com/hashtag/VenusWilliams?src=hash">#VenusWilliams</a> <a href="https://twitter.com/hashtag/AusOpen?src=hash">#AusOpen</a> <a href="https://t.co/b5EA3FFRwf">https://t.co/b5EA3FFRwf</a> —@Shashana80sKid

If <a href="https://twitter.com/hashtag/DougAdler?src=hash">#DougAdler</a> isn't gone, Venus should never entertain <a href="https://twitter.com/espn">@espn</a> again. If they allow this to go unpunished, we know how they feel about POC. —@iKira_bloom

<a href="https://twitter.com/PinaCocoblog">@PinaCocoblog</a> <a href="https://twitter.com/ESPNTennis">@ESPNTennis</a> <a href="https://twitter.com/espn">@espn</a> Take action ESPN. This is unacceptable. —@serve4thematch

"Appalling stuff," tweeted New York Times tennis reporter Ben Rothenberg. "Horrifying that the Williams sisters remained subjected to it still in 2017."

Not everyone agrees Adler's remarks were made out of racism as some feel he was merely showing his admiration for Williams' aggressive style of play in putting pressure on Voegele's second serve.

It was a very poor choice of words, but I don't believe the commentator was being racist towards <a href="https://twitter.com/hashtag/VenusWilliams?src=hash">#VenusWilliams</a> <a href="https://t.co/T6gUL7Ewr4">https://t.co/T6gUL7Ewr4</a> —@andreaprior

<a href="https://twitter.com/PinaCocoblog">@PinaCocoblog</a> <a href="https://twitter.com/ESPNTennis">@ESPNTennis</a> <a href="https://twitter.com/espn">@espn</a> nothing wrong there. It's not racist. So can't i say he/she charged like a bull etc? —@OldSchool1904

Williams, who has yet to comment on Alder's remark, defeated Voegele 6-3, 6-2 to advance to the third round.