35 straight wins by appearances in the 3R of a slam - currently owned by Lendl. He can tie this tomorrow, and surpass it by reaching the 4R in RG.
He can also surpass Lendl's record of 40 straight first round victories by appearances at Wimbledon, and tie Ferreira's consecutive slam appearances at 56 if he stays healthy through the USO. He can pass Vilas for most wins at RG this year as well, and move up the list for the US and at Wimbledon.
After those, the only ones that are left are pretty much all of Connor's records, time spent both total and consecutive in the top 4, top 5, top 10, total wins, total wins on Grass, GS wins on Grass, GS wins on Clay, total titles.
Pretty sure Connors' doesn't have that one. Guillermo Vilas has 75, ahead of Borg 63, then Connors 59 and Fed in 4th with 54. Vilas used to have 73, btw. His Wiki total in FO has been moved up from 56 to 58, after is was discovered RG 1972 did not have a 64-man draw as ATP claims but as 256-man draw.