The 2020 Travelers Championship is the third tournament to be played since the PGA Tour's restart.
Unlike the first two events, a handful of golfers withdrew prior to the event due to positive tests for COVID-19 to either themselves or those close to them.
Brooks Koepka and Webb Simpson did not test positive themselves, but because of concerns regarding members of their respective teams, they were two of five players who withdrew Wednesday.
However, the field still contains the top three players in the Official World Golf Ranking: Rory McIlroy, Jon Rahm and Justin Thomas.