Katie Boulter lost in straight sets to Anna Karolina Schmiedlova 6-4 6-0 in the first round of the Monterrey Open in one hour and 21 minutes on Monday.
The 24-year-old fell to the world number 111 in relatively disappointing fashion.
After the Brit went a break up to make it 3-2 in the opening set, the Slovakian immediately broke back before doing so again at 5-4 up.
'I'm emotional' - Robson and Wilander react to 'incredible' Boulter win
The world number 318 Boulter, who went out to Daria Kasatkina in the first round of the Australian Open last month, was then demolished in the second set.
At 3-0 down, Boulter received treatment on her right foot during a medical time out.
Heather Watson faces fellow Brit Harriet Dart, a lucky loser after Danka Kovinic pulled out of the tournament injured, on Tuesday.
Highlights: Kasatkina cruises past Britain's Boulter
'Ecstatic' - Boulter beats Garcia to set up Halep quarter-final showdown
WTA Indian Wells
Disappointment for Brits as Watson and Boulter crash out
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