In 2009, Weaver turned professional. Since 2010, Weaver has played mostly on the
eGolf Professional Tour and had a successful first year. Off-the-course matters diverted his focus for the first part of the year, as Weaver's mother was battling breast cancer. She regained her health and Drew regained his form. He finished outside of the top 8 only once on Tour after May 2010. He also played two events on the
PGA Tour in 2010: the
Greenbrier Classic and the
Wyndham Championship, where he tied for 41st. In 2011, he played in the
Memorial Tournament, finishing T45. It was his third cut in ten career PGA Tour events. In 2012, Weaver started his eGolf Tour season with two missed cuts. He won two events in the first half of the season and was the tour's money leader. He also became the quickest to earn $100,000 in a season. In 2015, Weaver qualified for
PGA Tour Canada with a T7 at the qualifying tournament. He won the first event of the season, the PC Financial Open. In 2017, Weaver won the GProTour event at River Hills Country Club April 5–6, by one shot with scores of 68-72 for a total of 140 (−2). ==Amateur wins==