Stacy Lewis has become the first American in 21 years to sweep the three biggest awards on the LPGA Tour.

Lewis closed with a 1-under 71 in the CME Group Tour Championship on Sunday, tied for ninth in the LPGA Tour finale.

She missed out on the $US1 million ($A1.08 million) winner’s prize, which went to New Zealand’s Lydia Ko, but it was still enough for her to win LPGA Tour player of the year for the second time in three seasons.

She also won the Vare Trophy for the lowest scoring average and the money title.

The last American to sweep the awards was Betsy King in 1993.

“The $1 million would have been nice,” said Lewis, who was six shots out of a playoff.

“But those three, that’s what I came here for.”

Two years ago, the 29-year-old Lewis became the first American since Beth Daniel to win the points-based player of the year. She added the Vare Trophy a year ago. And on Sunday, she collected all three at the same time.

Inbee Park, the world No. 1, was the only player who could have kept Lewis from the awards. She struggled all week at Tiburon Golf Club and finished in a tie for 24th, four shots worse than Lewis.

Lewis finished atop the money list with $US2,539,039, more than $US300,000 over Park.

Her scoring average was 69.532, while Park was second at 69.682. Michelle Wie was third in the Vare Trophy standings (69.818), followed by So Yeon Ryu at 69.978.

It was the first time in LPGA history that four women had a sub-70 scoring average.