London - Grigor Dimitrov had an easy ride into the last 16 at Wimbledon on Saturday when Dudi Sela was forced to pull out with an injury.
Israeli Sela, who had been struggling, quit after losing the second set, with the score at 6-1, 6-1 on Court Three.
Sela received treatment on his inner right thigh and battled on but eventually decided enough was enough.
It was the 11th retirement so far at Wimbledon - nine in the men's draw and two in the women's, notably that of Bethanie Mattek-Sands who suffered an horrific knee injury on court.
Dimitrov, 26, the Bulgarian 13th seed, is through to the fourth round for just the second time in his career.
The 2008 Wimbledon junior champion will meet either Roger Federer or Mischa Zverev on Monday for a place in the quarter-finals.
Wimbledon results on Saturday, the sixth day of the 2017 championships at the All England Club (x denotes seeding):
Grigor Dimitrov (BUL x13) bt Dudi Sela (ISR) 6-1, 6-1 - retired
Garbiñe Muguruza (ESP x14) bt Sorana Cirstea (ROM) 6-2, 6-2
Svetlana Kuznetsova (RUS x7) bt Polona Hercog (SLO) 6-4, 6-0
Magdaléna Rybáriková (SVK) bt Lesya Tsurenko (UKR) 6-2, 6-1