World number two Carlos Alcaraz said he "did not know how I'm still standing here" after battling to victory over Jaume Munar to reach the Queen's quarter-finals.
Spain's Alcaraz needed three hours and 26 minutes to beat his inspired compatriot 6-4 6-7 (7-9) 7-5 on a scorching London afternoon.
Alcaraz had two match points on his serve in the second-set tie-break but double faulted on one, and then had to come back from a break down in the decider.
The match took place just 11 days after the epic French Open final, where Alcaraz saved three championship points before battling back to beat Jannik Sinner and retain his title.