Nick Kyrgios has pulled out of the Mallorca Championships with pain in an abdominal muscle in a bid to ensure he's recovered and fit to play at Wimbledon next week.
The Australian No.2 withdrew from the tournament on Wednesday before he was due to face Spain's Roberto Bautista Agut in the last-16.
It followed a gruelling contest on Tuesday evening when the world No.45 came back from a set down to beat Serbia's Laslo Djere 5-7 7-6 (7-1) 7-6 (7-1).
"I'm really sorry I'm going to have to withdraw from tonight's match here in Mallorca. I have been playing a lot of great matches lately and unfortunately I woke up with a pain in my abs," Kyrgios said in a statement released by the organisers.
"I went to see the tournament doctor right away and he advised that I don't play tonight. I really value the Mallorca Championships but I will follow his advice as I don't want to risk Wimbledon next week.
"I was really looking forward to tonight's match as I've been loving my time here. Mallorca is such a beautiful island with really nice people."
Javier Cerrato, the tournament doctor, reported: "Nick Kyrgios suffers pain in the rectus abdominis on the left side due to the accumulation of matches in recent weeks and the effort of yesterday's first round match.
"This will not allow him to return to the court tonight."
Kyrgios's withdrawal ends a fruitful spell on the grass-courts, which has seen him reach two semi-finals in two weeks at Stuttgart and then Halle.
It has also prevented the prospect of a blockbuster quarter-final for the Australian against world No.1 Daniil Medvedev at the Spanish island tournament.