The rise of Mirra Andreeva has seemed inevitable ever since she burst on to the tour as a precocious 15-year-old more than three years ago, but this week, six months after her maiden grand slam triumph at Roland Garros, she has taken another massive step forward in her career. The 19-year-old will attempt to close out the most impressive week of her career by winning one of her most significant titles after thoroughly outplaying Jessica Pegula, the fifth seed, 6-3, 6-4 to reach the championship match of the WTA Finals at the Indian Wells Tennis Garden.

Related: Hot mics, Andreeva ‘diva’ drama and a stopgap finale at Indian Wells bail out the WTA | Tumaini Carayol

A year ago, Andreeva surprisingly failed to qualify for the WTA Finals, missing out by a paltry six points after bizarrely deciding not to compete in the final tournament week before the event. The world No 3 has been utterly supreme in her long-awaited debut appearance, bulldozing through elite opposition to reach the final without dropping a set. She has conceded just 18 games in four matches this week, including a 6-4, 6-0 demolition of the No 1 seed Aryna Sabalenka, winning 11 games in succession from 1-4 down.

Andreeva will rise to No 2 in the WTA rankings for the first time in her career on Monday regardless of the outcome here. The world No 1, Elena Rybakina, and No 3, Sabalenka, will both be defending a large number of points at the Australian Open after Rybakina defeated Sabalenka in this year’s final, which means the No 1 ranking will almost certainly be a realistic target for Andreeva at the start of the 2027 season, particularly if she closes out this imperious week with a title.

The Russian will face Ukraine’s Elina Svitolina after Svitolina dominated the Wimbledon champion Linda Noskova in the second semi-final, rolling to a 6-2, 6-0 win. Svitolina, who also beat Sabalenka this week, will be attempting to win the WTA Finals for a second time after first lifting the trophy in 2018. This will be a rematch of their encounter earlier this week during the group stage, which Andreeva easily won 6-4, 6-0.

Elsewhere, Sabalenka issued a public apology on Saturday after being accused of making offensive remarks towards Svitolina during Friday’s match. An angry Sabalenka was caught on camera making a comment between points, which some social media users interpreted as an offensive insult against her Ukrainian opponent.

“My comment was ‌not directed at Elina,” Sabalenka said in a ‌social media post.

“I was frustrated with a small group of spectators who were aggressively cheering my mistakes, and I reacted emotionally in the moment. That said, I should have handled ‌my frustration differently, and I apologise to anyone I offended. Elina played a great match, and I wish her all the best for the rest of the tournament.”

Any conspiracy theorist arguing that professional sport is scripted will perhaps end this week with a fresh spring in their step. This year’s WTA Finals, after all, began with an unexpected viral moment as Pegula’s stinging criticisms of Andreeva, whom she branded a “diva” after their practice, were caught on a hot mic and broadcast to the world. After Pegula apologised and both sides laughed off the incident, of course they would find themselves across the net for the first time in their careers in an official match at this tournament.

There are many positive things to say about the WTA Finals’ arrival in Indian Wells, particularly the strong crowds in an area so well accustomed to elite tennis, the unmatched desert landscape and the flawless temperature, but Indian Wells also notoriously presents challenging conditions in which to compete. From early on, heavy winds made it tough for both players to find rhythm and timing with both their serving and groundstrokes.

It took Andreeva some time to adjust to the conditions and she ended a messy early service game with a double fault to fall behind 2-1. However, as Andreeva began to demonstrate the full array of her numerous powers, she was by far the better player. Andreeva soaked up Pegula’s first strike with her brilliant defensive skills, consistently drawing errors from the American, but she also smartly chose her moments to step inside the court, take the ball early and redirect supremely off both sides. She served well in decisive games, effortlessly firing down 120mph service winners throughout the match. Pegula, for her part, has had to rely on her mental toughness in lieu of her top level for much of this week. Here she was simply too erratic and inconsistent against the WTA Tour’s newest diva.