REGINA, Saskatchewan (Ticker) -- Paul McCallum forced the first tie of the CFL season with a 37-yard field goal that capped the fourth overtime and pulled the Saskatchewan Roughriders even with the Calgary Stampeders, 52-52.

Any CFL game tied at the end of regulation goes to overtime. Teams get alternating possessions from the opponents' 25-yard line for up to four extra sessions.

Saskatchewan (0-3-1) scored first in the first three overtimes. Henry Burris threw a 20-yard touchdown pass to Curtis Marsh, McCallum kicked a 17-yard field goal and Burris and Marsh again hooked up on a 35-yard scoring toss.

Calgary (3-0-1) answered each time. Dave Dickenson threw TD passes of 24 yards to Allen Pitts and 10 yards to Travis Moore around a 37-yard field goal by Mark McLoughlin.

A 26-yarder by McLoughlin put the pressure on McCallum, who ended Saskatchewan's three-game losing streak and Calgary's three-game winning streak.

Burris completed 25-of-45 passes for 381 yards and five TDs. Dickenson was even better, going 24-of-35 for 476 yards and six scores.

Marsh caught eight passes for 126 yards and three scores and Eric Guliford had eight for 143 and one TD for the Roughriders. Moore had five receptions for 146 yards and two TDs for the Stampeders.