Kaori Sakamoto ended her career exactly as she needed to end it on Friday evening at the O2 Arena, winning her fourth world title in the final competitive program of a decade-long career with a personal best of 238.28. The story of the night belonged to her completely and appropriately.

But the bronze medal that Gabriela Juarez-Rivas claimed behind her and behind silver medalist Mone Chiba told its own story, and it was not a small one.

The 17-year-old had arrived in Prague two weeks earlier after Olympic champion Alysa Liu withdrew from the event. She had posted 76.26 in Wednesday's short program to sit third overnight and held that position through Friday's free skate with 148.81 for a total of 225.07, finishing 3.40 behind Chiba's silver and 9.87 ahead of Belgium's Nina Pinzarrone in fourth.

Her Carmen free skate was one of the cleanest she had produced all season. The triple Lutz-triple loop in the opening minute landed with certainty, the second half of the program held where it had cost her at the Grand Prix Final in December, and when the music ended she dropped to one knee at center ice before the scores confirmed what she already knew.

The season that brought her to that moment had been considerably harder than her results suggested. She won the Rostelecom Cup with a free skate she was not satisfied with. She finished third at Finlandia when she had expected more. She popped the opening combination of her free skate at the Grand Prix Final and finished second from first. She was fifth at Nationals in January and watched the Olympic team leave without her.

"The results were okay a lot of the time," she said after. "But I knew after almost every competition this season that I had not skated the way I know I can skate. You go back to the hotel with a medal and you are still sitting there knowing you left something on the ice."

Prague was where she stopped leaving things on the ice.

Chiba's silver at 228.47 was a personal best overall and in the free skate, achieved despite a shaky Lutz combination in the opening portion of her program. The Japanese skater had finished fourth in Milan and arrived in Prague determined to end the season with something to show for it. She leaves with a world silver medal and considerable momentum heading into the next Olympic cycle now that Sakamoto has retired.

Pinzarrone was fourth at 215.20 after two of the most consistent performances of her international career this week. Isabeau Levito was fifth overall with 206.99, her free skate strong beyond an underrotated opening combination. Amber Glenn dropped from fourth after the short program to sixth overall at 203.12 after a difficult middle section in her free skate, despite a clean triple Axel in the opening minute. Glenn and Levito's combined placements secured three World Championship spots for Team USA next season in Tampere, Finland.

At the press conference Sakamoto was asked about Juarez-Rivas. She said the young American would be difficult for everyone for a long time.

Juarez-Rivas heard about it afterward and went quiet for a moment. "Getting that from someone like her," she said. "I do not have the words for it yet."