Tilden reached the final of the mixed doubles competition at the U.S. National Championships three times: in 1907, 1910, and 1911.

In 1907, he partnered with Natalie Wildey and lost the final against May Sayers and Californian Wallace Johnson in two straight sets.

In 1910, he teamed with Natalie's sister Edna and lost in two sets to Hazel Hotchkiss Wightman and Joseph Carpenter, Jr.[1] His last mixed doubles came a year later, in 1911, again with Edna Wildey and they lost in two sets, this time to Hazel Hotchkiss Wightman and Wallace Johnson.

[2] Tilden won the NCAA Collegiate doubles tennis title in 1908 with Alexander Thayer playing for Penn State University.

[3] Tilden won the Delaware State doubles title in 1913 together with Alexander Thayer, beating George Church and A.M. Kidder in the final of the All-Comers tournament and F.C.