BASEL, Switzerland -- Stanislas Wawrinka lost in the first round of the Swiss Indoors on Tuesday, damaging his chances of playing in his first ATP World Tour Finals.
Wawrinka, ranked No. 8, struggled with his serve during his 6-4, 6-3 loss to Edouard Roger-Vasselin.
For the 29-year-old Roger-Vasselin, it was a first victory against a top-10 player this season and just the second of his career.
Wawrinka, a US Open semifinalist last month, is eighth in the points race to secure a place in the eight-man finals lineup in London next month.
The ninth player after next week's Paris Masters will advance, because Wimbledon champion Andy Murray is out due to back surgery.
Wawrinka, seeded No. 4, has now lost his opening match at Basel to a lower-ranked opponent in three of his past five visits.
Berdych lost his first-round match at Basel for the fourth straight time, all against opponents ranked below him.
Marcos Baghdatis of Cyprus beat German qualifier Benjamin Becker, 7-6 (8), 6-1, and Ivan Dodig of Croatia advanced after winning just two games when Carlos Berlocq of Argentina retired with an injury.