Kevin Sutherland and Scott Parel matched scores over five sudden-death playoff holes before darkness halted play in Sunday's final round of the Rapiscan Systems Classic in Biloxi, Miss.
The playoff will resume Monday morning, with Sutherland and Parel both seeking their second career Champions title.
Sutherland began the day with a three-stroke lead, but shot a 3-over 75 to finish at 7 under.
Parel capped a 3-under 69 with a birdie at the 18th to force the playoff.
Billy Andrade briefly held the lead with a birdie on the 15th to get to 8-under, but bogeyed the 16th and 18th holes to finish alone in third place at 6 under.
Sutherland and Parel exchanged pars on the first playoff hole, bogeys on the second -- when Sutherland missed a short par putt -- and pars on the third, fourth and fifth before losing daylight.
The last time a Champions event went to a sixth playoff hole was when Larry Nelson outlasted Gil Morgan and Jim Dent at the 2000 Vantage Championship. The last time a tournament was completed on a Monday was the 2016 U.S. Senior Open.
--Field Level Media