BOSTON — The Boston Celtics opened the Eastern Conference Finals with a 114-103 Game One win over the New York Knicks at TD Garden on Sunday afternoon, taking an early series lead behind a balanced offensive performance and a defensive scheme that limited Jalen Brunson to nineteen points on six-of-eighteen shooting.

Jayson Tatum led Boston with twenty-eight points, eleven rebounds, and six assists, while Jaylen Brown added twenty-three and Jrue Holiday recorded the kind of disruptive defensive line — three steals, two blocks, and primary coverage on Brunson for stretches of the second half — that has characterized the Celtics’ postseason approach. Brown’s late-third-quarter run of three consecutive triples opened a fifteen-point lead that the Knicks were never able to close inside ten the rest of the way.

Boston coach Joe Mazzulla, in his post-game availability, characterized the win as “the version of our offense we have been building toward” and credited the team’s six-day rest period for the precision of the half-court execution. Mazzulla said the team’s defensive scheme on Brunson had been “scenario-tested” extensively during the layoff and that the rotations had executed cleanly through most of the second half.

The Knicks struggled with both Brunson’s containment and with rebound positioning, surrendering fourteen offensive rebounds and twenty-two second-chance points across forty-eight minutes. OG Anunoby finished with sixteen points and eight rebounds and was the Knicks’ most efficient offensive contributor, but the team’s principal scoring engine never found its rhythm against Boston’s switching coverage.

Coach Tom Thibodeau, in his post-game remarks, said the team had “expected Boston to be the most prepared we’ve faced in this postseason” and indicated that the adjustments for Game Two would focus on offensive set design rather than on personnel changes. Thibodeau singled out the team’s interior rebounding as the principal area of focus heading into Tuesday’s game.

Brunson, in a brief post-game press availability, said the Celtics’ defensive coverages had been “exactly what we’d prepared for” but that the team had not executed against those coverages with the precision needed to win on the road in a conference final. Brunson said the team’s mental approach for Game Two would be focused on “the offensive details” rather than on broader strategic recalibration.

Game Two tips Tuesday at 8:00 p.m. Eastern at TD Garden, with ESPN carrying the broadcast. The series then shifts to New York for Games Three and Four on Thursday and Saturday, with the standard 2-2-1-1-1 format applied for any games beyond the fourth.

The Western Conference Finals tipped Sunday night at Paycom Center in Oklahoma City, with the Thunder hosting the Minnesota Timberwolves. Shai Gilgeous-Alexander turned in a thirty-eight-point performance to power Oklahoma City to a 122-114 home win and a 1-0 series lead. Anthony Edwards led Minnesota with thirty-one points but committed six turnovers, several of them in the closing five minutes.

Thunder coach Mark Daigneault, in his post-game remarks, said the team’s approach to the conference final would emphasize “the schemes that got us here” rather than substantial scheme departures. Daigneault credited the team’s home-court advantage at Paycom and the crowd’s role in sustaining defensive intensity through the second half.

Game Two of the Western series tips Tuesday at 9:30 p.m. Eastern, providing a TNT doubleheader with the Eastern Game Two. The two series’ overlapping schedule has been calibrated by league officials to avoid direct broadcast conflict, with the Eastern game tipping in the East-coast evening window and the Western game tipping in the prime-time window for the broader audience.

The NBA Finals are tentatively scheduled to begin Saturday, May 30, with the league office maintaining flexibility around the schedule depending on the pace at which the conference finals resolve. If either series goes seven games, the Finals would slip to early June. ABC will carry the Finals under the league’s existing broadcast arrangement.

Television ratings for Sunday’s Game One were the highest for an NBA conference-final opener in four years, according to early measurement data released by the league office Monday morning. The strength of the Boston-New York rivalry combined with the substantial East Coast prime-time audience to deliver the league’s most-watched single playoff game of the past two seasons.

Game Two preparation began for both teams Monday afternoon, with Boston returning to TD Garden for a closed practice and New York holding a full team meeting at the team hotel before traveling to TD Garden for a shootaround Tuesday morning. Both teams have reported no significant injury developments overnight.