Answer
Jason Roy's highest ODI partnership was 180 runs, which he scored alongside Alex Hales against Sri Lanka in 2016. The pair put on a dominant display, with Roy contributing a blistering 180 runs off just 151 deliveries. His innings included 16 fours and 5 sixes, showcasing his aggressive batting style. This partnership played a crucial role in England's victory, setting the foundation for a comfortable win.