Zaitcev has a career high ATP singles ranking of 296 achieved on 24 November 2014.

This ranking came shortly after his sole appearance at an ATP Challenger Tour Quarter-Final in Tashkent, Uzbekistan, where he was narrowly defeated by then world number 72 Sergiy Stakhovsky 6-4 5-7 4-6.

He also has a career high ATP doubles ranking of 232 achieved on 20 July 2015.

Zaitcev made his ATP main draw debut at the 2015 Kremlin Cup where he received entry to the doubles main draw as a wildcard entrant, partnering Richard Muzaev.

This biographical article relating to Russian tennis is a stub.