Many called for clarity, saying the public and players have a right to know who is suspected of cheating. Others warned that the match-fixing scandal has the potential to damage the reputation of tennis, just like doping or corruption scandals have hurt professional cycling, athletics, baseball and soccer.
Martina Navratilova, the 18-time Grand Slam champion, tweeted: "We need facts, not suppositions."
BuzzFeed titled its story, "The Tennis Racket," and said that half of those 16, including a Grand Slam winner, were at this year's Australian Open.
"This really casts a very dark shadow on our sport right now," Mary Jo Fernandez said on ESPN, as part of a panel discussion Wednesday on the controversy.
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"Hopefully because the world is watching, something will be done about it. We need to flag who these players were," said Fernandez, a three-time Grand Slam finalist, winner of two Grand Slam women's doubles titles and two Olympic gold medals.
His comments have resonated with those who say not knowing leads to dangerous speculation.
Until now, the average fan may have had little idea that tennis is one of the most gambled on sports in the world, with bookmakers actively taking bets mid-match.
"We knew in the tennis world this was happening at the lower levels of tennis, the equivalent of minor league baseball, now we're hearing a little bit more," McEnroe said.
"Where there's smoke, there's fire. This is a major, major wake-up call for the world of tennis."
The BBC and BuzzFeed report prompted an immediate news conference by tennis' governing bodies Monday in Melbourne Park, where representatives denied allegations that any evidence about match-fixing had been suppressed.
The problem for investigators, they said, is that match-fixing is very difficult to prove.
Many fans have also been shocked to learn that some of the sport's top players have been approached and offered big money to throw matches.
Novak Djokovic confirmed earlier in the week he was offered money to intentionally throw a match. Djokovic said that he was not directly approached but members of his support team were offered the money in Russia in 2007, an offer the player said was immediately rejected.
"I have been so sad about this the last few days," the 18-time Grand Slam winner said. "We as tennis players have always been so proud about the integrity of our sport."
"Hopefully the truth will come out," she said.
Andy Roddick thinks it will. The 2003 U.S. Open winner tweeted that he and another retired pro have been engaged in a guessing game: "Text I got from another former tour pro 'we should see how many of the 16 betting guys we can name. I think I got at least 8-9."