In three consecutive years, Nadal suffered from the same right knee injury. Let's count:
In 2017 he played 10 non-clay tournaments (Brisbane, AO, Mexico, Indian wells, Miami, WC, Montreal, Cincinnati, USO, Beijing) before injured the right knee in Shanghai.
In 2018 he played only three non-clay tournaments (AO, WC, Toronto) before injured the right knee in USO.
This year he played only two non-clay tournaments (AO, Mexico) before the same injury strikes again.
It looks that Nadal's right knee
1. is hardly to get cured.
2. cannot stand high-intensity competition on the hard/grass courts any more.
It is still highly likely that Nadal will shake any injury off on the clay court and dominate the upcoming RG. But if the right knee injury trend continues, his chance on non-RG slams is becoming slim.
In 2017 he played 10 non-clay tournaments (Brisbane, AO, Mexico, Indian wells, Miami, WC, Montreal, Cincinnati, USO, Beijing) before injured the right knee in Shanghai.
In 2018 he played only three non-clay tournaments (AO, WC, Toronto) before injured the right knee in USO.
This year he played only two non-clay tournaments (AO, Mexico) before the same injury strikes again.
It looks that Nadal's right knee
1. is hardly to get cured.
2. cannot stand high-intensity competition on the hard/grass courts any more.
It is still highly likely that Nadal will shake any injury off on the clay court and dominate the upcoming RG. But if the right knee injury trend continues, his chance on non-RG slams is becoming slim.