Caitlin Clark has been named the WNBA Rookie of the Year in a near-unanimous vote, giving the Indiana Fever back-to-back winners after Aliyah Boston won the honour last season.

A national panel of sportswriters and sportscasters gave Clark 66 of 67 votes in balloting released on Thursday, with Chicago Sky forward Angel Reese receiving the other.

The 22-year-old Clark, the No.1 overall pick from Iowa, has had an extraordinary impact on the game in the US.

She averaged 19.2 points and a league-best 8.4 assists per game while helping the WNBA set attendance records and garner mainstream attention.

She struggled a bit early in the season, but found her groove and was an All-Star starter, leading the Fever to the playoffs for the first time since 2016 and a 20-20 record after a 1-8 start.

"I'm a tough grader. I feel like I had a solid year," Clark said after the Fever were eliminated in the first round of the playoffs.

"For me, the fun part is like I feel like I'm just scratching the surface and I'm the one that's nit-picking every single thing I do.

"I know I want to help this franchise. ... I know there's a lot of room for me to continue to improve so that's what excites me the most. I feel like I continue to get a lot better."

Clark was not chosen for the US Olympic team — a decision that disappointed her legions of fans — but showed in the weeks afterwards she might have been helpful. The Fever guard averaged 24.7 points and 9.3 assists in her first 10 games after the Olympic break and led Indiana to an 8-2 record.

Clark also recorded the first two triple-doubles by a rookie in WNBA history, set a league single-game record with 19 assists and became the first rookie to have at least 30 points and 10 assists in a game.

She led the league with 122 three-pointers, was second with 90.6 per cent accuracy from the free-throw line and averaged 5.7 rebounds and 1.3 steals.

She set a league single-season record with 337 assists and set rookie records of 769 points and 122 three-pointers made.