Mahan withdraws, Johnson leads RBC Canadian Open Published on Friday, Jul. 26, 2013 05:07PM EDT Last updated on Saturday, Jul. 27, 2013 03:11PM EDT Tournament leader Hunter Mahan withdrew from the RBC Canadian Open on Saturday after his wife went into labour. The 31-year-old American was at 13 under after 36 holes and had yet to tee off in the third round. "I received exciting news a short time ago that my wife Kandi has gone into labour with our first child," Mahan said in a statement. Kandi and I are thrilled about the addition to the Mahan family and we look forward to returning to the RBC Canadian Open in the coming years. The sudden departure now puts the spotlight on John Merrick, who finished the second round two strokes back of Mahan after tying the course record with a 62 on Friday. Mahan was originally set to tee off at 1:30 p.m. ET on Saturday before play was suspended for 80 minutes because of the threat of lightning in the area. He had been rescheduled to tee off at 2:50 p.m. but never made it to the course and instead rushed to the airport. With Mahan's withdrawal, Merrick will play his round Saturday by himself, having declined the offer of a playing partner. Dustin Johnson shot 63 in rainy conditions on Saturday and was the clubhouse leader at 11 under after 54 holes.