Biggest Movers in the ATP Top 100 This Week Including Learner Tien and Lorenzo Sonego

With the Australian Open now deep into its second week, the new ATP rankings will reflect two intense weeks of tennis in Melbourne. Early exits for some established names and breakthrough runs from a new wave of contenders have reshaped the ATP Top 100, continuing the volatility that has defined the opening stretch of the season.

Australian Open Aftershocks

Riding the Melbourne Momentum: Learner Tien

Few players have maximised the Australian Open stage quite like Learner Tien. The young American’s run to the quarterfinals has translated into one of the most eye-catching climbs inside the Top 100 this fortnight. Already tipped as one of the tour’s future stars, Tien backed up his raw talent with composure and shot tolerance well beyond his years, picking up wins that carried significant ranking weight including a statement victory over Daniil Medvedev. His surge reflects not just a hot two weeks, but a player building on last year’s fourth-round showing and pushing firmly toward a career-high ranking of No. 24.

A Breakthrough Fortnight for Spizzirri

Elliott Spizzirri also emerged as one of the beneficiaries of the Melbourne fortnight. The young American’s run translated into a notable climb inside the Top 100, rising 14 spots in the rankings from No. 85 to No. 71, as he combined fearless shot-making with improved consistency under pressure. While still early in his development, Spizzirri’s performance in Melbourne suggested a player beginning to turn potential into tangible progress at tour level. He comes away as the only player to have taken a set off the world no. 2 and defending champion Jannik Sinner so far in the tournament. 

Darderi’s Steady Climb Continues

Luciano Darderi also made meaningful gains during the Melbourne fortnight, capping off the week at a career-high No. 23 in the world after reaching the round of 16. The Italian’s ability to translate his clay-court foundations to hard courts has been one of the quieter success stories of the tournament, with his physicality and improved point construction allowing him to compete consistently across conditions. While his run may not have carried the same headline weight as others, the ranking movement reflects a player steadily consolidating his place among the tour’s upper tier.

Big Match Wins, Big Ranking Leap — With a Bittersweet Twist

Lorenzo Musetti’s rise was powered by belief as much as results. The Italian’s ability to compete with, and trouble elite opposition in Melbourne resulted in a sharp upward trajectory during the tournament, briefly placing him on course for a significant rankings push. His aggressive baseline play and variety earned him valuable points, but injury intervened at the worst possible moment. Forced to retire during his quarterfinal against Novak Djokovic, Musetti was denied the chance to fully capitalise on his form. Still, the confidence gained from the deep run should carry beyond January, even as questions linger over what might have been.

Early Casualties: Rankings Reality Bites

On the opposite end of the spectrum, Lorenzo Sonego emerged as one of the most significant fallers in this week’s rankings, tumbling around 20 places after failing to defend the quarterfinal points he earned in Melbourne last season. An early exit proved costly in a fortnight where fine margins carried major consequences. While the slide does not signal long-term decline, it underlines just how unforgiving the Grand Slam calendar can be — particularly for players unable to defend deep-run points from the prior year.

Two weeks into the Australian Open, the rankings tell a familiar January story: youth surging, margins tightening, and opportunity favouring the bold. With semifinals and beyond still to be played, further movement is inevitable, and deep runs remain capable of reshaping the Top 100 before the tour shifts its focus to the indoor hard courts and the South American swing. For now, Melbourne has done what it always does best — shaken the ladder and revealed who is ready to climb.