Three-time Grand Slam semifinalist Grigor Dimitrov retired from his first-round match at Wimbledon against American opponent Steve Johnson after having a medical evaluation of his leg.

The 18th-seeded Dimitrov won the first set 6-4 and was trailing 5-2 in the second when the 31-year-old Bulgarian stopped playing on No. 2 Court.

Dimitrov reached the last four at the All England Club in 2014.