Qinwen Zheng becomes Player who lost the most games on the way a WTA Masters Title with 78.
I saw this stat from OptaAce and did some digging to see who lost the most games in a successful 1000 title run
Counting or not Counting Qualifiers
The Previous Record Holder was Either 2022 Cincinatti Carolina Garcia with 72, though 22 of those were in the Qualifier Round or Belinda Bencic in 2015 Toronto with 66 Losses on her way to the title all in the main draw.
WHAT A FIGHTER
Edit: Missed 2015 Bencic W/ Toronto