Funk forged a tie with playing partner Lehman thanks to a birdie the 18th hole of The Woodlands Country Club, carding a 3-under-par 69.
Lehman, meanwhile, birdied the 17th hole, recovering from a bogey on No. 16 to finish Round 2 with a 2-under 70 and tying Funk atop the leaderboard at 9-under 135.
Tied for fifth place at minus-7 were Bobby Clampett (67) and Michael Allen (68).
Duggar sisters unveil Christian dating rules in new book
Ohio bar shooting arrested, charged with murder