The 27-year-old's best performance in one of tennis' four marquee tournaments came in 2010 when he reached the quarterfinals of the U.S. Open.

CNN: U.S. No. 1 Isner out of Australian Open

On Tuesday, Cypriot tennis star Marcos Baghdatis threw a spectacular on-court tantrum at the Australian open, deliberately smashing four rackets in a row during a break between sets.

FORBES: Was Tennis Star's Racket Tantrum Revenge Against a Sponsor?