Early upsets in Challenger of Dallas

Two seeds are gone already in the $100,000 yp Challenger of Dallas men's tennis tournament after getting knocked out Monday in first-round upsets at T Bar M Racquet Club.

No. 4 seed Tobias Kamke and American veteran Rajeev Ram (No. 7) lost on the opening day, quickly exiting a field that -- including Kamke -- features four players from the top 100 of the ATP Tour singles rankings.

World No. 88 Kamke of Germany was ousted by India's Yuki Bhambri in a three-setter, 7-6 (7-3), 4-6, 6-4.

In the featured night match, Ram suffered a 6-4, 7-6 (7-5) defeat to Germany's Mischa Zverev, who was once ranked as high No. 45 in the world.

The doubles draw was rocked by an early upset as well, as Adham El-Effendi and Darren Walsh -- fresh out of SMU -- scored a 6-4, 7-6 (7-4) victory over No. 2 seeds James Cerretani and Izak Van Der Merwe. El-Effendi and Walsh had to win a separate wild-card tournament in January just to gain entry into the Challenger field.

Bahamas native Mark Knowles, formerly ranked No. 1 in the world in doubles and a former Grand Slam doubles winner at the Australian, French and U.S. Opens, is now a DFW-area resident and is playing this tournament with U.S. tour vet Robert Kendrick. In their first match, Knowles and Kendrick scored a 7-5, 6-3 win over the American duo of Sam Querrey and Chris Wettengel.