Robert MacIntyre birdied his final six holes at Caves Valley Golf Club to finish the opening round of the BMW Championship 8-under-par.

The temperatures in Owings Mills, Maryland, during the four tournament rounds are expected to be high 80s, perhaps reaching 90 by Sunday, according to Accuweather. There is an 80 percent chance of a thunderstorm during Thursday's first round. Expect it to be hot and humid all week, especially on the weekend.