Kemba Walker was certainly frustrated after his late-game gaffe that cost the Boston Celtics the W against the Oklahoma City Thunder.

Up one with the ball and just 13.8 seconds left, the game seemed fairly certain for the Celtics. Marcus Smart would then inbound the ball to Walker. However, rather than fouling, Thunder point guards Chris Paul and Dennis Schroder combined for some excellent defense on Walker, leading to a steal and an easy layup for Schroder to get the lead with 8.5 seconds remaining.

Jayson Tatum would miss the go-ahead bucket on the other end as time expired, pushing Boston to lose its fourth straight home game.

With Walker's turnover being the obvious catalyst for the team's loss on Sunday, the four-time All-Star spoke with the media after the game about the clutch time possession.

“Its frustrating. That’s the second time it’s happened in three games. So I just have to be better and just find a way to hold onto the basketball,” Walker said, per Jay King of The Athletic.

In only his second game back from a nagging knee injury that kept him out for six of the Celtics' last eight games, Kemba Walker scored 14 points on 4-of-14 shooting from the field while adding six rebounds and five assists.

The reeling Celtics will look to rebound at Bankers Life Fieldhouse as they travel to face the Indiana Pacers on Tuesday.