An own goal by Wycombe goalkeeper David Stockdale put the visitors ahead before Anis Mehmeti’s low strike drew Wycombe level.
The Chairboys then went ahead courtesy of Sam Vokes’ close-range header, but Sunderland managed to go in level at half-time following a neat finish from Ross Stewart.
Sunderland improved after the break and went close on several ocasions in a thrilling contest.
It then looked like Stewart had scored the winner when he put the Black Cats ahead in stoppage-time, only for Joe Jacobson to snatch a dramatic leveller.
Our chief Sunderland writer Phil Smith has delivered his verdict on how each Black Cats player fared at Adams Park
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1. Anthony Patterson - 6
Made a stunning reflex save early on and made some good contributions throughout on his return. Two set piece goals will frustrate, but there looked to be a clear foul in the first. 6 Photo: JPI Media
2. Carl Winchester - 6
Went close with a couple of really good efforts. Generally stood up to the test well on his return to right-back. 6 Photo: JPI Media
3. Tom Flanagan - 5
Battled really well in the first half, but had to battle through some uncertainty in the second as the Wycombe forward line caused him problems. Not at his best through that period. 5 Photo: JPI Media
4. Callum Doyle - 7
Got away with one lapse in possession during the first half but generally made excellent decisions on the ball and caused problems when he stepped out. Impressive 7 Photo: Frank Reid