Billionaire Bill Ackman and organizers of a tennis tournament have been strongly criticized by former grand slam champions and social media after the hedge fund manager made his pro tennis debut, a match he ended up losing.

The 59-year-old hedge fund titan made his pro-tennis debut in a competitive ATP doubles tournament alongside a Grand Slam champion, and it ended in a straight-set defeat.

Pershing Square founder Bill Ackman made his professional tennis debut. In a doubles match at the Tennis Hall of Fame Open, he and his partner lost in straight sets in a match that lasted just 67 minutes. Some tennis greats were sharply critical of the match.