It's always enthralling to see a young talent realised, even if it has been long forecasted.
But a moment of realisation, where everything clicks and stuttering potential morphs into roaring success, is even more giving: enter Canada's Victoria Mboko.
Twenty-two games unbeaten for an 18-year-old who at the beginning of the season was ranked 333 in the world, but is one match away from winning her home tournament – if she can beat top-tier ever-present and multiple Grand Slam winner Naomi Osaka in Thursday's final.
For Japan's Osaka, another match for her to underpin her gravitas in tennis' seemingly endless-yet-entertaining grind to prove current status.