Simona Halep was beaten on her return from a doping ban, going down in three sets to Paula Badosa at the Miami Open.
The Romanian, a two-time grand slam winner who spent 64 weeks as world No 1, was playing her first match since the Court of Arbitration for Sport reduced her suspension from four years to nine months.
Halep looked like she had never been away as she raced away with the first set in just 38 minutes.
But Badosa, herself a former world No 2, dug in to win 1-6 6-4 6-3.
Halep, who won Wimbledon in 2019, tested positive for the blood-boosting drug Roxadustat at the US Open in 2022 and was handed the lengthy suspension last September.
She appealed to CAS and, following a hearing last month, the court dramatically reduced the 32-year-old’s ban, allowing her to resume her career.
The ring-rust was evident when Halep, playing her first match in 18 months, lost the opening game to love and then double-faulted her first serve.
But an ace helped her to a hold and she promptly reeled off six games in a row to take control.
Yet Badosa broke early in the second and held on despite some fierce pressure to take the match to a decider.
Simona Halep made her return to tennis as she competed in the Miami Open against Paula Badosa
The Spaniard had the momentum and broke to love at the start of the decider, and although Halep hit straight back her energy levels were waning and Badosa wrapped up the victory in just under two hours.
Badosa is scheduled to play second seed Aryna Sabalenka in round two later this week, although there is understandable doubt surrounding the Australian Open champion’s participation after the death of her boyfriend Konstantin Koltsov on Tuesday.
Two more former world No 1s were also in action in the first round.
Dane Caroline Wozniacki swept past France’s Clara Burel 6-1 6-4 but Venus Williams, 43, was knocked out by 19-year-old Russian Diana Shnaider 6-3 6-3 in an hour and 19 minutes.
Diana Shnaider wins in two sets as she knocks out Venus Williams in Miami.
How to watch play on Sky Sports Tennis
The stars of tennis will appear on the new Sky Sports Tennis channel every day
Sky Sports has confirmed a new home for tennis in the UK and Ireland, with Sky Sports Tennis on Sky and NOW, making tennis content available all day, every day for fans.
Sky Sports will broadcast more live tennis than anywhere else, bringing over 4,000 matches from more than 80 tournaments a year on the ATP and WTA Tours, as well as full coverage of the US Open, all exclusively live.
Non-Sky subscribers can stream live matches with a NOW Sports Day and Month Membership, via Sky Sports Tennis, Sky Sports Arena, and Sky Sports Mix channels.
For further access, fans will also be able to follow their favourite players and gain deeper insights from both Tours via Sky Sports News, the Sky Sports app, on SkySports.com and via Sky Sports social channels.
Find out all the ways to watch tennis on Sky Sports, including the US Open, ATP and WTA tours.
Get Sky Sports on WhatsApp
You can now start receiving messages and alerts for the latest breaking sports news, analysis, in-depth features and videos from our dedicated WhatsApp channel!
Watch the WTA and ATP Tours throughout 2024 on Sky Sports Tennis. Stream Sky Sports Tennis and more with a NOW Sports Month Membership. No contract, cancel anytime.
