Two first-half goals from the hosts and a third in the second period proved too much to overcome, as a stoppage-time goal from David Wheeler was the only consolation for the Chairboys.
Wycombe travelled to Sunderland with the hopes of continuing their form and staying at the business end of the League One table.
The first five minutes were positive for Wycombe, who continued their high press which has caused issues for teams thus far in the season.
Sam Vokes was able to win an early header which dropped over the bar, and Anis Mehmeti’s constant presence in the opposition box when the defence were attempting to clear was also looking like it might pay dividends.
However, despite the bright start and arguably against the run of play, it was the home side who opened the scoring in the 14th minute. A cross from the right-hand side was met by the head of Ross Stewart, flying past David Stockdale and into the bottom corner.
Sunderland 1-0 Wycombe.
The goal pushed on an already settling Sunderland side, and it wasn’t long before their next opportunity allowed them to double their lead.
Some quick play down the right-hand side and then some individual skill from Elliot Embleton saw the Sunderland player let fly from 25-yards, flying into the top corner.
Sunderland 2-0 Wycombe.
Despite the deficit, the Chairboys continued to press high and were seeing joy on occasion, with Daryl Horgan and Anis Mehmeti linking up especially well on a number of attacking moves.
Sullay Kaikai, who had been working hard down the right-hand side was given an opportunity on the half hour mark, as Mehmeti’s high press saw the ball spill out to Wycombe’s number 16 who powered a shot goalward, only to see it blocked.
It was again Horgan and Mehmeti with a chance in the closing minutes of the half, as the former dinked a ball over the top just beyond reach but forcing a last-ditch clearance from the Sunderland back line.
With only one minute of added time, it was too much for Wycombe to make the pressure count, and they went into the changing rooms with a two-goal deficit to correct in the second half.
Half-time: Sunderland 2-0 Wycombe.
Sunderland, who had been growing in confidence as the first half drew to a close, started the second half with just as much energy.
The opening minutes of the half were halted after a crunching 50/50 challenge saw Kaikai come off worse and have to receive treatment.
Shortly after the stoppage, David Stockdale was called into action as some neat passing on the fringes of the 18-yard-box saw Sunderland able to unleash a low driven shot. Wycombe’s number 13 did well to get down and block, before Joe Jacobson cleared to prevent further danger.
Less than five minutes later, the Wycombe defence stood firm again as a Sunderland attack saw Ryan Tafazolli make a diving headed block to keep the deficit at two.
The Chairboys were creating their own chances however as the clock ticked past 60 minutes. Josh Scowen and Kaikai were getting into the right areas and causing issues, with Sam Vokes heading a cross into the hands of the Sunderland keeper from a well-placed cross.
A double substitution then saw both Vokes and Kaikai replaced by Adebayo Akinfenwa and Tjay De Barr in the 73rd minute.
With the Chairboys pushing forward, Sunderland were able to grab their third. An attacking move for Wycombe broke down and Ross Stewart made no mistake in smashing the ball into the top of the net after the ball was slid through from midfield in the 83rd minute.
Sunderland 3-0 Wycombe.
With just the three minutes of time to be added on, it was Wycombe who closed the scoring, as half-time substitute David Wheeler’s shot took a deflection and hit the back of the net.
Full time: Sunderland 3-1 Wycombe.