Venus Williams' return to tennis came to an abrupt end in the last 16 of the ATP/WTA DC Open on Thursday, with the veteran American losing to Poland's Magdalena Frech in straight sets.
The 45-year-old seven-time Grand Slam singles champion, playing this week for the first time in 16 months, had become the oldest woman to win a WTA match in more than two decades with Tuesday's first round win over Peyton Stearns.
But Williams found the going harder against fifth seed Frech in Thursday's third round clash, losing 6-2, 6-2 in one hour and 13 minutes.
Williams said she was nonetheless satisfied with her return to competitive tennis.
"I had so much fun," Williams said. "Not the result I wanted, but I got to play a lot of matches, definitely a plus. I couldn't be happier.
"I ran out of gas today unfortunately...Sorry to have fell short. But I know I can play better and I know I will play better," added Williams, who is due to play in next month's Cincinnati Open after being handed a wild card into the event.
Frech will face third seed Elena Rybakina in Friday's quarter-finals.
She had seized the early initiative with a dominant first set performance, breaking Williams in the fifth game and again in the seventh to take a 5-2 lead, before holding out to close the set.
Williams was soon in trouble in the second set, blasting a routine smash well beyond the baseline to give Frech two break points in the first game, which she pounced on to lead 1-0. Both players held on to their next service game, but Williams was unable to break Frech's serve in the fourth game as the world number 24 took a 3-1 lead.
Frech's shot variation continued to cause Williams problems in the next game and two wild long forehands from the veteran saw her surrender another break to go 4-1 down. With the game slipping away, Williams loosened up and began to find her range to break back for 4-2.
The rally was fleeting as Frech broke again in the seventh for a 5-2 lead and then held to seal victory. (AFP)