Watson and Robson crash out
Heather Watson blamed a "bad day at the office" as she and Laura Robson made first-round exits at the BNP Paribas Open in Indian Wells.
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British number one Watson, ranked 39 in the world, was below par against Romania's Irina-Camelia Begu, losing 6-2 6-4 in one hour and 43 minutes.
"Today wasn't my best day at the office," she admitted on BBC Radio 5 live.
"I didn't really play well but my opponent is a great player and I feel like these courts really suit her game, and she played very smart. I wasn't really able to keep many balls in play. I wasn't really there today."
She added: "I feel the courts are just very different, like a clay court - they're very, very slow and it bounces very high here."
World number 43 Robson looked like she would make smooth progress to round two when she led Sweden's Sofia Arvidsson by a set and 4-1.
But the wheels came off the teenager's erratic game as Arvidsson hit back to win 2-6 7-6 (7/2) 6-1.
It is Robson's third first-round defeat on the trot after starting the year in encouraging fashion with a run to the third round of the Australian Open.
Since then, the 19-year-old has lost to the lower-ranked Daniela Hantuchova in Doha and Yulia Putintseva in Dubai.
Both Robson and Watson will now look to get back on track at the Sony Ericsson Open in Miami, which begins on March 19.
Elsewhere, American 16-year-old Taylor Townsend claimed her first WTA Tour win with a 3-6 7-6 (7/1) 6-3 defeat of world number 57 Lucie Hradecka.
Wild card Townsend took two hours 11 minutes to defeat her Czech opponent to set up a meeting with Serbia's Ana Ivanovic.
Poland's Urszula Radwanska, younger sister of Agnieszka, set up a second round meeting with American Sloane Stephens after beating Holland's Arantxa Rus 6-3 6-3 in 88 minutes.
Monica Niculescu needed just 52 minutes to dismiss qualifier Elina Svitolina 6-0 6-0 to earn a clash with Belgium's number 28 seed Kirsten Flipkens.
There were also wins for Kimiko Date-Krumm, Alize Cornet, Kiki Bertens, Mirjana Lucic-Baroni and Jamie Hampton.
Daniela Hantuchova won through to the second round along with Alexandra Dulgheru, Magdalena Rybarikova, Stefanie Voegele, Garbine Muguruza and Madison Keys.