The 2019-20 season saw the emergence of Jayson Tatum as a genuine star.
Tatum – the third pick in the 2017 NBA Draft – turned potential into performance as he capped a memorable campaign with All-Star honours for the first time in his career.
An elite scorer, Tatum was at the forefront of everything good about the Celtics before and after the coronavirus pandemic.
But, the Celtics still lost in the Conference finals for the third time in four years – beaten 4-2 by the Miami Heat at Walt Disney World Resort – after finishing third in the east with a 48-24 record.
The Celtics are yet to reach the NBA Finals since 2009-10, while the historic franchise have not got their hands on the Larry O'Brien trophy since the Doc Rivers era in 2007-08.
As the Celtics reflect after watching the Los Angeles Lakers equal their record for most championships (17), we review the team's 2019-20 campaign using Stats Perform data.
Boston's dynamic trio
Kemba Walker's arrival in Boston helped create a formidable trio alongside Tatum and Jaylen Brown.
After spending his entire NBA career at the Charlotte Hornets, four-time All-Star Walker opted for a new challenge via free agency by committing to a four-year, $141million contract with the Celtics.
As a result, Terry Rozier left the Celtics for the Hornets in a sign-and-trade last year.
Since investing in Walker, the Celtics have put together a stellar trio, which became just the second group of three team-mates in NBA history to average 20-plus points and 2-plus three-pointers made per game apiece in a season (minimum 50 games played).
Walker averaged 20.4 points and 3.2 three-pointers made per game during the regular season, to go with Tatum (23.4ppg and 2.9 3pm) and Brown (20.3ppg and 2.3 3pm).
The only other trio to do so were the Golden State Warriors' Stephen Curry, Kevin Durant and Klay Thompson in 2017-18.
Tatum joins elite list
It was a coming of age for Tatum, much to the delight of the Celtics and all those connected with the team.
Tatum cemented himself as one of the best players in the league by averaging 23.4 points, 7.0 rebounds and 3.0 assists per game – up on his 2018-19 averages of 15.7ppg, 6.0rpg and 2.1 apg.
The 22-year-old also enjoyed a fine playoff campaign, becoming only the third player in NBA history to average 25.0-plus points, 10.0-plus rebounds and 5.0-plus assists per game in a single postseason with 15 or more games played.
Lakers superstar LeBron James (in 2014-15 and 2019-20) and Boston's Larry Bird (in 1983-84 and 1986-87) are the only other players to reach the feat.
Lack of depth
For all of Boston's good work and impressive starting five, their lack of depth was exposed in the playoffs.
The Celtics relied on their starters more than any other team in the postseason at 83.3 per cent with 1,549 of their 1,859 points scored by the starting five, ahead of the Philadelphia 76ers (83.1 per cent), Indiana Pacers (82.6 per cent), Houston Rockets (77.3 per cent) and Portland Trail Blazers (76.5 per cent).
As for the portion of minutes played by starters in the postseason, the Celtics (75.0 per cent) again topped the list ahead of the Pacers (72.2 per cent), 76ers (72.0 per cent), Utah Jazz (71.8 per cent) and Rockets (70.9 per cent).
The Celtics had fewer than 25 bench points in each of their last 15 playoff games this year, one of the longest streaks in a single postseason in the past 35 years, only behind the Detroit Pistons (19 in 2005) and Pacers (17 in 2013).
The problem of a thin bench was likely exacerbated by the number of close games the Celtics played in, since teams usually need their best players on the floor for longer periods of time in tight encounters.
Boston had eight playoff games decided by five points or less, tied for second most in a single postseason in franchise history.
Also, this was the second consecutive year the Celtics had some issues with turnovers in the playoffs. After going plus-1.4 for turnovers in the regular season, Boston were then minus-1.4 in the postseason.