This project is probably not intended to reach past The Great War, but I happened to be rummaging around some of the krosero archelology, and he excavated a few pre-War parchments. These precious few relics with ace counts for Maurice McLoughlin:
1914 Davis Cup Challenge Round vs. Norman Brookes: 21 aces/25 service games. Huge Match against one of the greats.
1915 US Nat'l SF vs. Theodore Pell: 12/12 (or 13)
But also more normal-looking:
1913 US Nat'l SF vs. Wallace Johnson: 6/19
1914 US Nat'l SF vs. Dick Williams: 11/20
And, the day after his 12/12, only 3 aces in 20 service games vs. Billy Johnston.
". . . was given credit for taking tennis from the softer game it had been before he came along with his mighty service and samashing style . . .
. . . Oddly enough, the Comet lost his famous service shortly after the Davis Cup matches of 1914. He doesn't quite know what happened, except that he was unable to swing a racket with his old freedom. 'The big punch suddeny left,' he said.'"
Grantland Rice, "The Comet," in Danzig and Schwed, The Fireside Book of Tennis, p. 83.
Potentially fascinating performances from the "Red" McLoughlin.