Rumor: Sylvester Stallone And Robert De Niro To Star In 'Grudge Match'?

Briefly: In May, we heard that Warner Bros. had picked up a pitch from Tim Kelleher to write a film called Grudge Match, about "retired boxers Billy "The Kid" McGuigan and Henry "Razor" Sharp, lifelong bitter rivals who are coaxed out of retirement and into the ring for one final grudge match — 50 years after their last title fight." It seemed like an unusual pitch for the studio to buy — a boxing movie about old guys? Not exactly what most studios are developing of late, but definitely a potentially welcome change of pace.

Now there's a rumor that Robert De Niro and Sylvester Stallone might star. Production Weekly reports the rumor, but as the outlet did it via tweet, there's no other info right now. That leaves us to ponder what the intersection of Rocky, Raging Bull and Grumpy Old Men might be like. Assuming the rumor is true, that is. Would Sylvester Stallone get in the ring for a non-Rocky boxing movie?