The inevitable positive tests for COVID-19 on the PGA Tour made a direct impact on the betting odds entering the Travelers Championship.
After Cameron Champ tested positive on Tuesday, Brooks Koepka and Graeme McDowell withdrew Wednesday morning following positive tests by their caddies. Koepka's younger brother, Chase, followed suit later Wednesday, as did Webb Simpson, the latter out of an "abundance of caution" following a family member's positive test.
Coming off a tie for seventh at the RBC Heritage, Koepka had been the most popular bet at DraftKings, responsible for 10 percent of the handle and 6 percent of the total outright winner bets at the sportsbook as of Tuesday. Simpson was one of the pre-tournament favorites coming off a victory last week that vaulted him to No. 5 in the world.
"In the last 24 hours, I had a family member test positive for COVID-19," Simpson said in a statement. "While my tests this week were negative, I feel like it is my responsibility to take care of my family and protect my peers in the field by withdrawing from the Travelers Championship.
"I am going to return home to Charlotte and quarantine under CDC guidelines, and I look forward to returning to competition after that time period."
Following the announcement of Simpson's withdrawal, top-ranked Rory McIlroy saw his odds shorten to +1000 at DraftKings, making him the co-moneyline favorite along with Justin Thomas. Bryson DeChambeau is next at +1100. The trio were listed as co-favorites at +1000 by PointsBet.
Second-ranked Jon Rahm was +1600 at DraftKings, followed by Dustin Johnson, Justin Rose at +2200. PointsBet listed Johnson and Patrick Cantlay at +2200, followed by Rose and Schauffele at +2500.
Daniel Berger, who won the first event back from the Tour's hiatus two weeks ago, previously withdrew from the Travelers Championship due to an undisclosed reason. He also tied for third last week.