Britain's Dan Evans suffered a defeat by world number two Carlos Alcaraz in a closely-fought third round tie at the Shanghai Masters.
He saved six break points - from 13 in the first set - during a fifth game that lasted nearly 20 minutes before losing the opener on a tie-break.
Evans was then broken when serving to stay in the match in the second set.
"It was a really tough match," said Alcaraz.
"It was one of the toughest matches I have played outside of the Grand Slams.
"Every time I play Daniel it is a tricky match and I have to play my best to beat him.