March 28 (Reuters) - German fourth seed Alexander Zverev

overcame tricky conditions to beat Hungary's Fabian Marozsan 6-3

7-5 on Thursday and reach the Miami Open semi-finals.

    Zverev attacked Marozsan's serve and converted three of his

seven break-point chances, swatted aside the two break points he

faced and won 80% of his first serve points en route to the last

four in Miami where he has yet to drop a set.

    Despite not dropping a set in windy conditions, Zverev had

his hands full with Marozsan, who is making his Miami debut and

enjoyed top-10 upsets over Holger Rune and Alex de Minaur on the

way to the quarter-finals.

    "If he continues playing like that he's going to rise up the

rankings very quickly and he's going to be one of those (top 10)

guys himself," Zverev said in his on-court interview.

    "When we are in control, I think all top players when they

are in control they feel like they can manage the match,

manipulate the match a little bit in their own favour.

    "But against him that's not possible. That's why he has such

a great top-10 record and he's an unbelievable player."

    Zverev's win, sealed with a break when he unleashed a

brilliant backhand down the line, marked his return to the Miami

Open semi-finals for the first time since his runner-up finish

in 2018.

    Zverev will next face either Spanish top seed Carlos Alcaraz

or Bulgarian 11th seed Grigor Dimitrov.

(Reporting by Frank Pingue in Toronto, editing by Ed Osmond)

((frank.pingue@thomsonreuters.com; +1 (647) 480-7636;))