The 1921 Ottawa Rough Riders finished in second place in the Interprovincial Rugby Football Union with a 3–3 record, but failed to qualify for the playoffs.
Regular season Standings + Interprovincial Rugby Football Union 2009 Canadian Football League Facts, Figures & Records, Canadian Football League Properties/Publications, Toronto, Ontario, , p.294 Team GP W L T PF PA Pts Toronto Argonauts 6 6 0 0 167 35 10 Ottawa Rough Riders 6 3 3 0 77 71 6 Hamilton Tigers 6 3 3 0 102 79 6 Montreal AAA 6 0 6 0 29 190 0
Schedule Week Date Opponent Results Score Record 1 Oct 1 at Montreal AAA W 20–5 1–0 2 Oct 8 vs. Hamilton Tigers W 19–6 2–0 3 Oct 15 at Hamilton Tigers L 13–15 2–1 4 Oct 22 vs. Montreal AAA W 28–7 3–1 5 Oct 29 vs. Toronto Argonauts L 3–11 3–2 6 Bye 7 Nov 12 at Toronto Argonauts L 5–28 3–3
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