Runas can’t call with top pair

From mid position, Tofie Runas limped in, the cutoff player raised to 400, the button player and the small blind called, then Runas reraised it to 1600. Acting next, the initial raiser, the cutoff, quickly folded while the other two still in the hand made the call. At the flop of 2♣ K♦ 9♦, Runals bet 3200, got called by the button player while the sb folded. At the turn of A♦, both players opted to check. Then on the river of 3♦, Runas checked, the button bet 5675, and Runas folded after showing his A♠ top pair.