Saim Ayub's One Day International (ODI) career, though brief, has been highly impactful since his debut against Australia on November 4, 2024, in Melbourne. In just 17 matches played as of November 2025, Ayub has amassed a significant 751 runs with a remarkable batting average of 46.94 and a dynamic strike rate of exactly 100.00. He has registered three centuries and three half-centuries, with his highest score being a fluent 113*. A notable early highlight was scoring his maiden ODI century against Zimbabwe in November 2024 with a 53-ball hundred, marking it as the second-fastest by a Pakistani cricketer. He continued this dominant form, playing a pivotal role as Pakistan's top run-scorer in multiple series and securing back-to-back centuries during the team's historic ODI whitewash in South Africa in December 2024, earning him a Player of the Series award. Beyond his opening batting heroics, he has contributed with the ball, taking 9 wickets as a part-time off-spin bowler, averaging 41.56. His stellar 2024 performance, which included 515 runs in nine ODIs at an average of 64.37, earned him a nomination for the prestigious ICC Men's Emerging Cricketer of the Year award.