Friday, December 16, 2016

Horford's Continued Presence in Lineup Should Fix Defensive Woes, but Rebounding Remains Long-Term Concern for Celtics

                The sexy pick of this year’s preseason, the Boston Celtics have not lived up to expectations. Sitting at 13-12 and tied for sixth in the Eastern Conference, the Celtics are a mediocre team at best. They are winless (0-7) against teams with an above .600 record and still lack a signature victory. Hovering around .500 (8-7) in “clutch” games, which the NBA defines as contests with the score within five points in the last five minutes of the fourth quarter, Boston does not look the part for a team many pundits predicted would contend for the No. 2 seed in the East and potentially challenge the defending champion Cleveland Cavaliers come playoff time.
                Boston’s issues lie on the defensive end and in the rebounding department. Wedged in the middle of the pack at 13th in team defense—surrendering 103.2 points per game—the Celtics are not challenging opponents at a level true contenders must do. Boston’s defense, a strength of the team in the 2015-16 campaign in which it held opponents to 44.1 % shooting with an opponent adjusted field goal mark of 48.7%, has struggled mightily this season.
                The absence of four-time All-Star and elite post defender Al Horford for 10 games this season has had a shattering impact on the defense. Horford missed nine contests with a concussion injury sustained in practice and another game to accompany his wife in the hospital as the couple welcomed their second child to the world.
                Horford was signed to a four-year, max contract deal in the summer in part for his outstanding defense in the post. According to ESPN Stats & Information, Horford defended a league-high 262 direct posts—a post-up attempt in which a player shoots, is fouled, turns the ball over or passes to a shooter—last season and allowed just 0.84 points per direct post. Of the top-12 players with the most direct posts defended, only Golden State Warriors forward Draymond Green allowed fewer points (0.72) per direct post in 2015-16.
Al Horford is Boston's catalyst on defense. (Bob DeChiari/USA Today Sports)

                A closer look at the Celtics’ season results reveal major discrepancies in defensive effectiveness with Horford in the lineup compared to games without him. The Celtics allow 101.8 points per contest in games in which Horford has suited up—much less than the whopping 106.2 points surrendered without him in the lineup.
                Horford provides the Celtics with a much-needed rim protector. A year after blocking a career-best 121 blocks in 2015-16, Horford ranks sixth in the NBA with 2.2 blocks per game.
                While injuries are not an excuse—particularly for a team with a head coach as touted as Brad Stevens—the Celtics clearly have been a much team defensively with Horford manning the center duties. In addition to Horford, starters Isaiah Thomas (groin) and Jae Crowder (ankle) missed games due to injuries. Boston has played with its regular starting five of Horford, Thomas, Crowder, Avery Bradley and Amir Johnson for just 10 games this season, winning seven of them.
                An area in which the Celtics will likely not improve anytime soon is rebounding. The Celtics rank 28th in rebounding and Bradley, the team’s starting shooting guard, is the only player on the roster who has elevated his game in this facet for the season. He has registered a team-best 7.6 boards per contest with an 11.8% rebounding rate. 
                But the 6’ 4’’ Bradley can only do so much and it’s alarmingly evident the team must add another big man to the roster. The Celtics were expected to be a worse rebounding team this year in the wake of the offseason departures of Evan Turner and Jared Sullinger, but certainly not to this degree. And now that the defense has taken a hit as a result of their anemic ability to grab boards, the onus lies on President of Basketball Operations Danny Ainge to acquire an impact player down low for Boston to have any shot of making noise in the Eastern Conference.

*Statistics/Information accurate as of 12/15/16