World number five StefanosTsitsipas landed 39 straight first serves en route to claiming a 3-6 6-1 7-6(5) comeback win over Dominic Thiem at the Madrid Open, with the Greek crediting his focus and relaxation for his near-perfect serving performance.
Tsitsipas looked in danger of falling in his first match of the tournament on Saturday, but he found a way back into it by dominating the second set and then clinching the tie-break in the decider.
The 24-year-old ended with a first serve percentage of 79%, significantly higher than the 57% he managed in his straight sets defeat to Carlos Alcaraz in last week's Barcelona Open final.
"That's fantastic, 39 is a lot," Tsitsipas said of his streak.
"That's a positive mark for me. I think I just owe it all to fluidity and just being relaxed on my serve... I think it's just pure relaxation and focus."