Nadal unable to beat Kyrgios though and so we have a Masters tournament with none of the 'Big Four' in the semi finals. It must be well over 10 years since that happened. However, despite Kyrgios' win it still isn't a sufeit of youngsters with both Isner and Ferrer in their 30s.
ETA Apparently it wasn't that long ago, Paris 2012, which was Ferrer's only Masters win. If he were to repeat this it would be another in thus strange season of older, over 30, and younger, under 22 winners.
It could well be that the US Open has 5-7 of the top ten not playing.