Andy Murray made an early exit from the BNP Paribas Open at Indian Wells with a surprise defeat by Argentine world number 53 Federico Delbonis.
The British number one, playing his first ATP tournament since becoming a father last month, was beaten 6-4 4-6 7-6 (7-3) in the third round.
The Scot, 28, was well short of his best, squandering a 4-1 third-set lead before losing the decisive tie-break.
Johanna Konta progressed in the women’s draw by beating Denisa Allertova.
Out-of-sorts Murray squanders third-set lead
In windy conditions, 25-year-old Delbonis struck first, taking the first set with a break in the seventh game.
An early break in the second set appeared to have put Murray back on track as he forced a decider.
And the world number two looked firmly in control when he opened a 4-1 lead in the final set, only to win just one of the next six games to fall 6-5 behind.
He broke back to force the tie-break but Delbonis seized the initiative to set up a match with either France’s Gael Monfils or Spain’s Albert Ramos-Vinolas.
Elsewhere, Canada’s Milos Raonic progressed after Bernard Tomic was forced to retire because of injury.
Analysis – Murray should have sewn things up
BBC tennis correspondent Russell Fuller:
“Close followers of Murray’s desert fortunes have seen similar performances in the past, but from 4-1 up in the deciding set, the world number two knows he should have comfortably sewn things up.
“The drop shot – with which Murray has thrilled and frustrated in equal measure over the years – was overused in the closing stages: a sign of Murray’s lack of confidence from the back of the court in these unique conditions.
“The ball flies through the desert air, and can bounce up quite high: unlike the humidity of Miami, where Murray will be heading for his next challenge.”
Konta’s fine season continues
Konta, seeded 25, was a 6-4 6-1 winner over Czech Allertova, who had beaten Australian Open champion Angelique Kerber in the previous round.
The Briton, 28, broke Allertova’s serve in the fifth game of the opening set before taking full control in a dominant display.
Konta told BT Sport: “She definitely came out playing at an incredibly high level. I needed to get going to stick with her.
“I fought the hardest I could fight and took some opportunities when I got them.”
She will next face Czech Karolina Pliskova, who defeated Ana Ivanovic 6-2 6-0.
Italian ninth seed Roberta Vinci eased to a 6-1 6-3 success over Ukraine’s Elina Svitolina to book a meeting with Magdalena Rybarikova of Slovakia.