The era of Michael Phelps and Ryan Lochte dominating the global scene in the men’s 400m IM is officially over; neither Phelps or Lochte will be swimming the 400m IM at this summer’s Olympic Games in Rio.

While Michael Phelps opted not to swim the 400m IM, and hasn’t indicated any interest in swimming it since his comeback in 2012, Lochte swam it at the 2016 U.S Olympic Trials in Omaha, Nebraska. Despite heading into finals as the second seed, Lochte was beaten by not just one, but two swimmers.

Chase Kalisz touched in first in 4:09.54 and Jay Litherland threw down a massive last 100 to take down Lochte by a full second with a 4:11.02. For the first time since the 2004 Olympic Trials, Lochte’s name was not one of the top two on the megatron at the CenturyLink Center.

This Olympic Games will be the first since the 2000 games in Sydney, Phelps first Olympics, to not feature either Lochte or Phelps in the 400m IM.

Over the past 14-years, Phelps and Lochte have collected an impressive medal haul in the 400m IM alone. Phelps earned two Olympic golds, two world championship titles, and two Pan Pacific Championship titles.

Lochte earned one Olympic gold, one Olympic bronze, two world championship titles, one world championship silver, three short course world championship titles, and one Pan Pacific Championship title.

Collectively, the two have rocked this event and made it almost impossible for anybody to step into their spotlight.

Lochte’s 4:12.66 performance from earlier this season indicated that he would be a prime candidate to continue that legacy in Rio, however arguably the most grueling event in swimming’s repertoire will fall into the hands of Kalisz and Litherland.

Since 2012, neither Phelps or Lochte have placed much importance on the 400m IM and that’s allowed for Chase Kalisz to squeeze into the shoes of the two studs. In 2013 he took home silver at the world championships. In 2014, he finished third in the 400m IM at Pan Pacs. In 2015, he picked up a world championship bronze in the event.

Lochte entering the 400m IM at trials meant the possibility of the revival of the Phelps-Lochte era, however Kalisz, who’s been the most dominant 400m IMer in the States besides over the last quadrennial shut him down, ushering in the new age of the American 400m IM.

Jay Litherland is no stranger to success either. Last summer Litherland took home gold in the 400m IM at the 2015 World University Games.

Although Kalisz and Litherland now hold the responsibility of filling Phelps and Lochte’s shoes, the American medley season is looking strong moving forward past 2016.

Kalisz redshirted this season to train with Bob Bowman in Arizona, however he’s one of three Georgia swimmers who finished within the top four in tonight’s final. Litherland also trains at Georgia as does Gunnar Bentz who finished fourth behind Lochte.

The talent at Georgia is huge, but that’s not the only place that holds the future of this event’s success for the United States. Sean Grieshop, 17, finished fifth in tonight’s final in 4:14.08 after breaking the world junior record in prelims with a 4:14.00.

With Phelps and Lochte gone from the event, a new era of American medley is stepping forward. All the fresh faces and excitement just means one thing: they have some enormous shoes to fill.