The teenager was arguably England's best performer in Dortmund, where goals from Harry Kane and Ollie Watkins thrust the Three Lions into a second consecutive European Championship final.
Mainoo had made history just by taking to the field at the Westfalenstadion, becoming the youngest-ever England player to represent the country in a major semi-final.
But even before that game against the Dutch, some notable data emerged, when Opta confirmed that Kobbie's overall pass completion rate (96 per cent) was the highest ever recorded at a European Championship by a midfielder (minimum 100 passes).
Prior to the Netherlands tie, Kobbie had completed 133 of his 138 passes, which put him ahead of figures like Rodri (Spain), Joshua Kimmich (Germany) and Luka Modric (Croatia).