Pictured: Andrey Rublev and Marat Safin.

Marat Safin: How former No 1 can make Andrey Rublev part of the tennis elite

Safin and Rublev have officially paired up ahead of the Monte Carlo Masters.
Andrey Rublev
Sam Cooper

Andrey Rublev adds two-time Grand Slam winner to coaching team

Andrey Rublev has lost the opening match of his last three tournaments.
Andrey Rublev has spoken to former No 1 Marat Safin

Andrey Rublev reveals help from former world No 1 amid disappointing run

Rublev has struggled for form recently - and turned to a former Slam champion for advice.
Russian world number ones - Kafelnikov, Medvedev, Sharapova
Michael Graham

Russian world No 1s: Daniil Medvedev joins a list of fascinating sporting characters

In terms of just the ATP rankings, Medvedev is only the fifth man to get to world number one in 18 years.