These athletes made a huge impact in the first year at their respective levels of competition. Below, FloTrack's top five newcomers of the year.

5. Grant Holloway

Grant Holloway was a catalyst for the University of Florida in his freshman year, successfully leading the Gators to the team title at the NCAA Division I Outdoor Championships and runner-up honors at the NCAA DI Indoor Championships.

The Virginia native won NCAA DI titles in the 60m hurdles and 110m hurdles, turned in a runner-up performance in the outdoor long jump, placed 11th in the indoor long jump, helped the Gators place 11th in the 4x100m relay, plus delivered thrilling anchor legs on the 4x400m relay for runner-up honors indoors and a fourth-place finish outdoors.

Watch Grant Holloway split 44.1 at the Florida Relays:

4. Emmanuel Korir

Emmanuel Korir is the rare college track and field athlete who is so utterly dominant in his event — the 800m — that he turned pro after competing for just one year in the NCAA. The 2017 NCAA track seasons saw him win DI indoor and outdoor titles in the event and clock the second-fastest time in collegiate history, 1:43.73, which would have shattered Jim Ryun's collegiate record if Donavan Brazier hadn't clocked 1:43.55 a year prior. Korir's PB in 2016 was just 1:46.94, which makes his world-class ascension even more astonishing. 

The 22-year-old was undefeated for most of the year through the Kenyan World Trials and the Monaco Diamond League meeting, and likely would have been the favorite for the world title if a hip flexor injury had not knocked him out of worlds in the semifinals.

3. Charlene Lipsey

Charlene Lipsey had never broken 2:00 for 800m before this year; by summer's end, she had run faster than the U.S. record indoors (1:58.64) and became the seventh-fastest American of all-time in the event (1:57.38). The former LSU Tiger left Baton Rouge to train with Olympian Ajee' Wilson in Philadelphia, a move that proved fruitful for both athletes as Lipsey made her first world team with a runner-up finish at the USATF Outdoor Championships and Wilson set the American record (1:55.61) and earned bronze at the IAAF World Championships.

Before this year, Lipsey's PB was 2:00.60 and her best career finish at USAs was sixth. In 2017, she won the USATF Indoor 1K title, anchored the gold medal-winning 4x800m at World Relays, placed runner-up at the USATF Outdoor 800m, placed seventh in the world final, and broke two minutes 10 times.

2.  Karsten Warholm

Two years after earning silver in the decathlon at the European Junior Championships, the 21-year-old Karsten Warholm was the surprise victor in the 400m hurdles at the IAAF World Championships over defending Olympic champion Kerron Clement. The European Junior champion won the Bislett Games, set the Norwegian national record at 48.22, and earned runner-up honors to Kyron McMaster — the fastest man in the world this year — at the IAAF Diamond League final in Zurich. Not bad for just one year after being eliminated in the semifinals at the Olympic Games.

1. Jakob Ingebrigtsen

Norway's Jakob Ingebrigtsen caused a huge stir this summer when, at 16 years old, he became the youngest sub-four miler in world history by running 3:58.07 at the Prefontaine Classic. The teen swept the 5K and 3K steeplechase at the European Jr. Championships and the 1500m and 5K at the Norwegian National Championships, the latter event in 13:35.84, a new national junior record over Sondre Nordstad Moen, who would later become the first European man to run under 2:06 in the marathon. His genes indicate future success at the senior level, as well, as older brother Filip was the 1500m bronze medalist at this summer's IAAF World Championships.