LOS ANGELES » Kobe Bryant has decided to retire after this season, ending his 20-year career with the Los Angeles Lakers.

The 37-year-old Bryant made the announcement in a post on The Players’ Tribune on Sunday, writing a poem titled “Dear Basketball.”

“My heart can take the pounding. My mind can handle the grind. But my body knows it’s time to say goodbye,” wrote Bryant, the third-leading scorer in NBA history. “And that’s OK. I’m ready to let you go. I want you to know now. So we both can savor every moment we have left together. The good and the bad. We have given each other all that we have.”

Bryant went straight from high school in suburban Philadelphia to the Lakers in 1996, and he earned five championship rings and 17 All-Star selections during two decades with the franchise — the longest tenure with one team in NBA history. The top scorer in Lakers history also won two Olympic gold medals.

But Bryant’s last three seasons have ended early due to injuries, and he played in only 41 games over the previous two years. He has struggled mightily in the first 15 games of this season with mostly young teammates on a rebuilding roster, making a career-worst 32 percent of his shots and dealing with pain and exhaustion every day.

The Lakers (2-13) hosted the Indiana Pacers on Sunday night, and fans arriving at Staples Center received a letter from Bryant in a black envelope embossed with gold.

“What you’ve done for me is far greater than anything I’ve done for you,” Bryant wrote. “I knew that each minute of each game I wore purple and gold. I honor it as I play today and for the rest of this season. My love for this city, this team and for each of you will never fade. Thank you for this incredible journey.”

In recent months, Bryant repeatedly said he didn’t know whether he would play another season, clearly hoping for a rebound in his health and the Lakers’ fortunes.

Neither has happened, and the ever-impatient Bryant didn’t wait any longer to decide his future.

“Kobe Bryant is one of the greatest players in the history of our game,” NBA Commissioner Adam Silver said. “Whether competing in the Finals or hoisting jump shots after midnight in an empty gym, Kobe has an unconditional love for the game. I join Kobe’s millions of fans around the world in congratulating him on an outstanding NBA career and thank him for so many thrilling memories.”

Bryant warmed up for Sunday’s game amidst even more than the usual swarm of camera phones and flashes surrounding the court. He lip-synched along with a song during drills, and he stopped several times to hug familiar faces at courtside, including actor Michael B. Jordan, longtime Lakers fan Arsenio Hall and former Pacers great Reggie Miller, who got a long bear hug.

Bryant then missed his first six shots, including three 3-pointers, before making a layup late in the first quarter. He finished the first half with six points on 2-for-15 shooting.

Even during his late-career struggles with the foundering Lakers, Bryant’s fans have remained devoted to the 6-foot-6 star who won titles alongside Shaquille O’Neal in 2000, 2001 and 2002 before teaming with Pau Gasol for two more in 2009 and 2010. Only 13 players in league history played on more championship teams than Bryant.

And even with the Lakers already likely to miss the playoffs for the third straight season — a first in franchise history — Bryant intends to keep going. He decided to suit up against the Pacers on Sunday even after playing 34 minutes at Portland on Saturday night.

“He kind of shocked me when he told me,” said Lakers coach Byron Scott, Bryant’s teammate during the 1996-97 season. “I’m just sad, more than anything. It’s always hard when greatness like Kobe decides to hang it up. … I thought he probably had at least another year, but this year isn’t over.”

Bryant is the NBA’s highest-paid player this season with a $25 million salary bestowed on him by grateful Lakers owner Jim Buss despite his recent injury problems.

Bryant’s presence guarantees wild crowds wherever the Lakers play. He has been tirelessly devoted to the franchise, repeatedly declaring he would never play for another NBA team in his final seasons despite the Lakers’ wholesale rebuilding process following the disastrous 2012-13 season with Dwight Howard and Steve Nash.

But Bryant’s departure will allow the Lakers to split between the past and the future, with young prospects Julius Randle, D’Angelo Russell and Jordan Clarkson taking on leading roles rather than deferring to their superstar teammate.

General manager Mitch Kupchak has spent his entire career building rosters around Bryant, but the executive acknowledged frustration with the Lakers’ incredible struggles in Bryant’s final two seasons.

“Clearly we’re not playing at the kind of level that a player of Kobe’s age and experience finds challenging, kind of like there’s no light at the end of the tunnel,” said Kupchak, who didn’t learn of Bryant’s decision until Sunday afternoon. “So I’m not surprised that he would make the announcement now. I think the game will be easier for him now. I think he’ll be able to enjoy the rest of the season.”

Bryant repeatedly declared that he didn’t want a farewell tour in the style of Kareem Abdul-Jabbar or Derek Jeter, his friend and The Players’ Tribune founder. Yet the Lakers’ eight-game road trip beginning next week is almost certain to begin a prolonged goodbye to Bryant, one of the NBA’s most popular and most divisive players.

Bryant already has received long ovations on road trips this season, particularly in places like New York and Miami where crowds sensed that they might be seeing him as an opponent for the final time.

The Lakers’ next road game is in Philadelphia on Tuesday — perhaps not coincidentally, given the otherwise strange timing of Bryant’s announcement.

“Philly is where I grew up,” Bryant told AP in an interview in Miami earlier this month. “It’s always a different emotion there than anywhere else.”

Bryant was the first guard ever to be drafted directly out of high school, taken 13th overall by the Charlotte Hornets and traded to the Lakers. Although he won the dunk contest at All-Star weekend as a rookie, his Lakers didn’t become title contenders until coach Phil Jackson arrived in 1999 and built a three-time champion around Kobe and Shaq.

Bryant made a fourth NBA Finals appearance in 2004 despite his preseason arrest for sexual assault and subsequent legal proceedings that sometimes required him to fly from Colorado to Los Angeles on game days. The assault case against Bryant was dropped in September 2004, but his acknowledged poor behavior affected his reputation and endorsement deals for years.

Bryant scored 81 points against Toronto on Jan. 22, 2006, the second highest-scoring performance in NBA history behind Wilt Chamberlain’s 100-point game. The Lakers struggled until Gasol arrived via trade in 2008 and they appeared in the next three NBA Finals, winning two.

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AP Basketball Writer Tim Reynolds in Miami contributed to this report.