Denis Istomin becomes record 12th man to withdraw from 2015 US Open
Add Denis Istomin's name to the already lengthy list of those unfit to continue during the 2015 US Open after he retired from his second-round match against Dominic Thiem on Thursday.
Istomin retired to Thiem down 2 sets & 1-0 in 3rd. He & Sock lift men's retirement total for tourney to 12, new Open Era record in Majors.
— ESPNTennis (@ESPNTennis) September 3, 2015
Earlier Thursday, American Jack Sock fainted a third of the way through the fourth set of a second-round match against Ruben Bemelmans. The 28th-ranked Sock was up two sets to one, poised to advance to the third round and face Stan Wawrinka.
Instead, Bemelmans will be the heavy underdog against the fifth-ranked French Open champion.
Related - Record number of men's players retire in Round 1 of US Open
Like Sock, Istomin will leave Flushing Meadows wondering if he was ill-prepared for the record temperatures and humidity.
Even if he had been fit to continue, the lanky Uzbekistani likely would have lost his second-round match to Austrian youngster Thiem, who's ranked No. 20.