LOL.
I've no idea what the actual record is, but just as an example, Ivan Lendl in 1980.
He started his season that year in February. Thereafter he played 138 singles and 66 doubles matches during the season, all the way through to the Masters which was actually played in January 1981. So that's 204 matches in 48 weeks. Among those were 26 singles and 4 doubles played in Bo5. But it gets crazier when you look at it closely.
From his first event at Rancho Mirage in California starting 11 February, he played a tournament every week for 16 consecutive weeks, culminating at the French Open. During that time he played 88 matches in 112(?) days. One singles title captured (highlighted in bold). The consecutive weeks break down as: Rancho Mirage, Denver, Memphis, Washington, Rotterdam, Frankfurt, Milan, Monte Carlo, Houston (S), Los Angeles, Las Vegas, Dallas, Dusseldorf, Hamburg, Rome, Paris. So he had to somehow squeeze three transatlantic flights in there as well as part of his schedule, without a week off.
He then played six consecutive weeks in the run-up to and including the US Open. Singles and doubles combined was 43 matches in 47(?) days. Another one singles title captured. Kitzbuhel, North Conway, Indianapolis, Toronto (S), Cincinnati, US Open, with a transatlantic flight after the first event.
Then in the autumn, he played eight events in consecutive weeks. 47 matches in 56 days, five singles and a doubles title won. Madrid, Barcelona (S & D), Basel (S), Tokyo-1 (S), Tokyo-2, Hong Kong (S), Taipei (S), Bangkok, with a Europe-to-Far East flight in the middle.
His total also includes ten Davis Cup matches played for Czechoslovakia as they won the title for the first time.
