WATCH: Elena Rybakina's sister Anna becomes her squad's biggest cheerleader behind the scenes as Kazakhstan enters United Cup SF

Elena Rybakina's sister Anna voiced her resounding support for the Kazakhstan team currently participating in the 2025 United Cup. The Kazakh contingent has been impressive so far at the international mixed-team tennis event, and the collective, led by WTA World No. 6 Rybakina, has booked a spot in the tournament's semifinals.

In the quarterfinals, Kazakhstan faced Germany and established a 1-0 lead in the tie after Rybakina downed Laura Siegemund 6-3, 6-1. The next match saw Alexander Shevchenko come out on top against Daniel Masur 6-7(5), 6-2, 6-2 to put Kazakhstan in an unassailable position. Masur was the replacement of injured ATP World No. 2 Alexander Zverev.

After Shevchenko's win, the Kazakh team indulged in fervent celebrations in the locker room. Here, Elena Rybakina's elder sister Anna was arguably the loudest, as the team banded together and jumped in delight at making the semis of the 2025 United Cup.

Watch the Kazakh team's jubilant celebrations led by Rybakina's sister Anna, unfold below:

25-year-old Rybakina, the winner of the 2022 Wimbledon Championships women's singles title, has cemented herself as one of the top female players in contemporary tennis.

Meanwhile, her elder sister Anna, who turned 28 in September last year, is a digital creator. The sisters were born and brought up in Moscow, and both shared a passion for sports growing up.

Anna was also present to cheer Rybakina on at the 2024 Wimbledon Championships. During her younger sister's quarterfinal clash against Elina Svitolina, Anna was captured experiencing a rollercoaster of emotions.

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Elena Rybakina's sister Anna was all nerves during Kazakh's Wimbledon 2024 QF

Anna (L) and Elena Rybakina (R) (Source: Getty)

Anna had a visibly nerve-racking experience during younger sister Elena Rybakina's 2024 Wimbledon quarterfinal matchup against Elina Svitolina. The Kazakh eventually emerged victorious with a rather comfortable 6-3, 6-2 win over the Ukrainian.

However, in some of the match's most tense moments, the cameras caught Anna producing a wide range of facial expressions. At one point during the decisive game in the first set, she had completely closed her eyes, seemingly unable to bear the anxiety of the proceedings. Rybakina would eventually falter in the semifinals, losing to eventual champion Barbora Krejcikova.

At the 2025 United Cup, Rybakina has been in red-hot form for Kazakhstan. The former World No. 3 has so far played three singles rubbers and one mixed doubles rubber, winning all of them. She has started the new tennis season with former ATP No. 2 and 2001 Wimbledon champion Goran Ivanisevic as her new coach.