Becky Hammon and the Las Vegas Aces got an up-close look at Caitlin Clark and the red-hot Indiana Fever this week.

The back-to-back champion Aces won both games at Gainbridge Fieldhouse—beating the Fever 86-75 on Wednesday and 78-74 on Friday. But Hammon walked away with an impression of Indiana’s stellar trio of Clark, Aliyah Boston and Kelsey Mitchell.

“They’re a three-headed monster,” Hammon said. “You have to play defense against this team, otherwise they’re too good offensively. We don’t want to get in a situation where we have to outscore them, because they’ve got some really unbelievable scorers.”

Mitchell is Indiana’s leading scorer through 38 games this season, scoring 19.3 points per game. Boston is averaging a near-double-double with 14.1 points and 9.1 rebounds per game, and Clark is scoring 19.1 points per game and broke the WNBA single-season record for assists on Friday night.

The Fever look a lot different than they did in the first few weeks of the regular season. After losing eight of their first nine games, Indiana has gone 18-11 since the calendar flipped to June and 8-4 since returning from the WNBA’s month-long Olympic break.

If the regular season ended today, the Fever would play the Connecticut Sun in a best-of-three series in the opening round of the playoffs. Indiana is 1-3 against Connecticut this season, but its first three losses all came before June 10; the Fever defeated the Sun 84-80 at home on Aug. 28.

The Fever may not be a championship contender yet, but Hammon and the rest of the WNBA know Indiana is on the rise.