The Celtics  got another MVP-like performance out of Rajon Rondo , and it was just enough to edge the Milwaukee Bucks  (1-4) in overtime, 105-102, at the TD Garden Wednesday night. Rondo finished with 17 points, 15 assists and eight rebounds to help the C’s improve to 4-1.
Paul Pierce  led all scorers with 28 points — the final six at the free throw line in the last 13 seconds — to eclipse 20,000 career points  and, fittingly, put the game away. The milestone carried undeniable significance for the 13-year Celtics veteran.
“You don’t see it too often where a player accomplishes that type of feat with one team,” an emotional Pierce said after the game. “It means a lot to me. I’m not even going to downplay it. … Five years ago, I wouldn’t have even dreamed that I would have scored 20,000 points in a Celtics uniform. The team was going in a direction, I was a disgruntled player at the time. To still be here talking about this feat, it’s an incredible moment for me.”
THREE THINGS THAT WENT RIGHT
THEY FOUND THEIR FIFTH GEAR: After an Ersan Ilyasova 3-pointer put the Bucks up 80-74 with 3:29 to play, the Garden got awfully quiet. The Celtics’ closing five — Rondo, Ray Allen , Pierce, Kevin Garnett  and Glen Davis  — changed that, quickly.
Over the next 2:09, the C’s outscored Milwaukee, 16-4, taking a six-point lead with a minute to play and igniting the hometown crowd. In that two-minute span, Garnett and Bucks big Andrew Bogut  picked up double technicals after the former dunked on the latter, leading to a shoving match.
Rather than disrupt the C’s momentum, especially in the wake of the day’s KG-Charlie Villanueva  Twitter fiasco, the incident seemed to ignite their fire further. Led by another sparkplug (who else but Rondo?), the Celtics literally ran all over the Bucks to pour fast break layup after layup into the net.
The Celtics showed a gear that other teams — even the Bucks, a 2009-10 playoff team — just can’t match. And it came on the second night of a back-to-back, in the fourth quarter. Sure, it took overtime for the C’s to Sear the Dear, but Wednesday night was going Milwaukee’s way until that two-minute stretch.
ALLEN’S GOT HIS GROOVE BACK: The memory of Allen shooting just 3-of-14 in Game 7 of the 2010 NBA Finals  was burnt into the minds of many Celtics fans throughout the offseason. Critics claimed the veteran may have been entering the so-called twilight of his career.
But a shooter like Allen never loses his stroke, even at age 35, especially when it’s as sweet as Ray’s. Twice already this season — Wednesday night against the Bucks (23 points on 9-of-20 shooting) and opening night against the Heat (20 points on 7-of-13 shooting) — he has demonstrated that he can still fill it up against the league’s best.
DEFENDING THE POINT GUARD: We know what Rondo is capable of offensively, but the Celtics point guard is already making a run at a second straight All-Defensive First Team selection. He held Brandon Jennings  — a legit Rookie of the Year candidate last season — to just 13 points on 5-of-13 shooting. Rondo also kept Jennings from finding open teammates, limiting him to four assists in 34 minutes.
Wednesday night’s performance came on the heels of Rondo’s defense against Detroit’s Rodney Stuckey , who was limited to 6-of-15 shooting and three assists Tuesday night.
THREE THINGS THAT WENT WRONG
WHERE’S THE BENCH? The Celtics were essentially playing with a six-man roster for the majority of the game against the Bucks, as Glen Davis (14 points, 4 rebounds) provided the team’s only real contribution from the pine.
Meanwhile, Nate Robinson , Von Wafer  and Semih Erden only played 10 minutes between them. The Small 3 combined for a whopping two points, six rebounds and one assist. When Rivers played a lineup of Erden, Davis, Daniels, Wafer and Robinson, they managed to make a 25-16 lead at the end of the first quarter turn into a 32-31 lead midway through the second quarter.
DEFENDING THE CENTER: Entering Wednesday night’s game against the Bucks, Celtics centers had to defend the following guys: Joel Anthony  (Heat), Ryan Hollins  (Cavaliers ), Timofey Mozgov (Knicks) and an 87-year-old Ben Wallace  (Pistons) — not exactly the Bill Russell s of this era.
Bogut was the C’s first true test at the 5 spot. The No. 1 overall pick in the 2005 draft and an All-NBA Third Team selection last season, Bogut ate up the Celtics duo of Jermaine O’Neal  and Erden to the tune of 21 points and 13 rebounds.
SAME OLD, SAME OLD: There are three statistics Doc Rivers  is going to point to over and over again throughout this season: turnovers, rebounds and veteran minutes. The first two will likely determine when the Celtics end up in the loss column. And the third could signal how often they end up there.
The Bucks led the turnover (11-16) and held the rebounding advantage for much of the night, until the Celtics edged them out, 43-42, in the overtime period.
Meanwhile, Allen, Pierce and Garnett combined for 120 minutes. That’s a direct result of the bench’s lack of production. If the C’s need those kind of minutes — especially in the second of back-to-back games — to pull out wins against good teams, that spells trouble in the form of fatigue down the road.