Brennan opens up on “GMA” about “On Her Game,” her new biography about the WNBA star.

Sports columnist and ABC News contributor Christine Brennan is the author of “On Her Game: Caitlin Clark and the Revolution in Women’s Sports.”

Tensions rose as Clark and the Indiana Fever faced off against Reese and the Chicago Sky during the WNBA season opener.

Michael Lewis, who was arrested on Sunday, said "Guilty as charged" when the Indiana judge greeted him during his initial hearing on Tuesday. The judge said he should remain silent.

Michael Lewis, 55, was arrested on Sunday in Indianapolis and has been charged with stalking for allegedly sending "numerous threats" to Caitlin Clark, officials said.

Michael Lewis, 55, was arrested on Sunday in Indianapolis and has been charged with stalking for allegedly sending the basketball star threats over social media, officials said Monday.

"GMA" shares highlights of the WNBA opening games on Sunday where Caitlin Clark made her playoff debut.

Both WNBA players had their last chance to compete against one another for the battle for Rookie of the Year honors.

Biles and Thomas watched Clark play at an Indiana Fevers game.

The Indiana Fever star is now the record holder for the most three pointers in WNBA rookie history by sinking her 86th three-pointer in her debut season, breaking Rhyne Howard's 85 set record.

Reese recorded her 13th consecutive double-double, breaking the WNBA record set by Candace Parker, while Clark became the first rookie to score a triple-double.

Clark and Reese, who faced off against each other in the 2023 NCAA Championship Game, are the only two rookies to make the league’s All-Star team.

USA Basketball spoke out defending its decision to leave Caitlin Clark off the Paris Olympics roster.

According to The Athletic, Caitlin Clark is reportedly the top alternate for Team USA ahead of the Paris Olympics.

ABC News contributor Christine Brennan reacts to WNBA rookie Caitlin Clark being left off the roster for the U.S. women's Olympic basketball team.

Team USA faces fallout after the WNBA rookie and college basketball star was not selected for the Olympics in Paris.

Plus, a federal judge in New York has given the go-ahead for a class action lawsuit against Cold Stone Creamery for allegedly serving pistachio ice cream that does not contain pistachio.

Chicago Sky player Chennedy Carter is facing criticism after she was seen body-checking Indiana Fever's star, Caitlin Clark following a play. ABC News' Rhiannon Ally has the new details.

The college rivals will face off for the first time in their WNBA careers on Saturday. ABC News’ Morgan Norwood breaks down the biggest moments.

Stephanie White, head coach of the WNBA's Connecticut Sun, discussed Clark's historic endorsement deal with Wilson Sporting Goods.

Clark now becomes the first and only athlete since Michael Jordan to have a signature collection with Wilson and is also the first female athlete ever to have her own Wilson collection.

The 2024 WNBA top pick, Caitlin Clark, has entered a multiyear partnership with Wilson Sporting Goods, the company announced Tuesday.