(Updates with first completed matches Friday)

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Colombian Mariana Duque-Marino was bounced out of Wimbledon in the second round, losing to British hopeful Laura Robson 6-4, 6-1 on Friday.

Duque-Marino got off to a strong start, but the 38th-ranked Robson's superior serve and more powerful ground strokes soon turned the contest, played under the roof on Centre Court, in her favor.

Despite the defeat, the 23-year-old Duque-Marino, currently ranked No. 117, posted her best result to date at the All England Club. In her only other main-draw appearance at Wimbledon, she lost in the first round in 2010 to Japan's Kurumi Nara.

The Colombian's second-round contest had been scheduled for Thursday but it was postponed by rain.

Rain also caused delays on the outer courts early Friday afternoon, but play has since resumed and several second-round matches have been completed.

German No. 7 seed Angelique Kerber was the latest high-ranked player to be upset at this year's tournament, falling to Estonia's Kaia Kanepi 3-6, 7-6 (8-6), 6-3, while American Alison Riske defeated Poland's Urszula Radwanska 4-6, 6-3, 6-4.

Bulgaria's Grigor Dimitrov, the No. 29 seed, lost to Slovenia's Grega Zemlja 3-6, 7-6 (6-4), 3-6, 6-4, 11-9; 26th-seeded Alexander Dolgopolov of the Ukraine defeated Colombia's Santiago Giraldo 6-4, 7-5, 6-3; German No. 13 seed Tommy Haas defeated Taiwan's Jimmy Wang 6-3, 6-2, 7-5; and France's Jeremy Chardy, the No. 28 seed, edged Germany's Jan-Lennard Struff 6-2, 5-7, 7-6 (8-6), 7-6 (7-4).

This year's Wimbledon has been rife with upsets, including the shocking early-round exits of two-time champion Rafael Nadal in the first round and seven-time champion Roger Federer and 2004 champion Maria Sharapova in the second round. EFE