ATP roundup: Teenager Justin Engel wins opener in Kazakhstan
Jannik Sinner survives challenge from Cincinnati qualifier Alex Michelsen
Fifth seed Medvedev eases into second round with win over Kovacevic
ATP roundup: Nuno Borges delights home crowd in Estoril as clay quarters loom
Feeling 'invincible': Carlos Alcaraz resumes hunt for maiden French Open title
Kosovo tennis federation accuses Serbia's Novak Djokovic of fuelling tension
