British number two Heather Watson was knocked out the Citi Open in the first round with a straight-set defeat by Romania's Patricia Maria Tig.
The 25-year-old lost 7-6 (7-4) 7-6 (7-3) in two hours three minutes to the world number 134 in Washington.
Watson, who wasted set points of her own in the first set, saved two match points before Tig took the tie-break to win her first match since March.
Tig will face Monica Niculescu or Nao Hibino in round two.