Paris (France) (AFP) - Alexander Zverev said he was “annoyed” at having to justify being world number one as he lost his opening match at the Paris Masters, while 24-time Grand Slam champion Novak Djokovic also crashed out in a Wednesday full of upsets.

Long seen as tennis’ nearly-man, the 29-year-old broke his major duck this year by winning the French and US Opens, which propelled him to the top of the ATP rankings for the first time in his career this month.

But his reign as world number one got off to a disappointing start as 24th-ranked Lorenzo Musetti eased to a 7-6 (⁷⁄₅), 6-2 win over the German to reach the third round.

“Stress, I don’t know if stress. I was a bit annoyed, to be honest,” Zverev told reporters.

“I feel like I’m the only world number one in tennis history that has to explain why it’s okay for me to be world number one, which I find quite difficult, because I think I deserve to be where I am, even though I lost today.”

After being in a dominant position in the first-set tie-break, Zverev accumulated errors to lose five consecutive points and then six of the following eight games to crash out at the first hurdle.

For Musetti, however, the big-serving Hamburg native deserved his place atop the rankings as he was “the most consistent amongst all the players”.

“I said even before playing with him that today was going to be the best challenge and the toughest challenge that this sport can give me. So I’m really happy that I took my chances today,” the Italian former world number five added.

- Top seeds tumble -

Djokovic saw his hopes of winning an eighth Paris Masters title and qualifying for the ATP Finals disappear as he went out 2-6, 6-3, 6-3 to world number 83 Rinky Hijikata.

After sailing to the first set, the 39-year-old then found himself in a battle with the Australian qualifier.

Hijikata broke Djokovic in the eighth game of the second frame before serving out to force a decider.

The third set ground on until the Serb cracked twice in a row on serve to hand his 25-year-old opponent victory.

The loss effectively brought to an end Djokovic’s season with the veteran telling reporters his plan for the coming weeks was “just rest”.

The 2023 Australian Open doubles champion will play Tomas Martin Etcheverry for a berth in the quarter-finals, after the Argentine downed Australian eighth seed Alex de Minaur 7-6 (⁷⁄₂), 6-3.

Former world number one Daniil Medvedev joined the top-seed exit list as the fifth-ranked Russian crashed out in straight sets to Peru’s Ignacio Buse.

Elsewhere, seventh seed Frances Tiafoe also fell in his opening match, going down 6-3, 1-6, 7-6 (¹¹⁄₉) to Quentin Halys.

The Frenchman’s victory over the American was doubly good news for the host country as it meant Arthur Fils qualified for the ATP Finals.

The French world number seven is now assured of making his debut at the season-ending tournament, which runs November 15-22 in Turin.

With that weight off his shoulders the 22-year-old will want to put on a show at his home Masters when he takes on Tomas Machac later in the night session.

Ahead of Fils in the primetime slot, seven-time Grand Slam champion Carlos Alcaraz will begin his campaign against Alex Michelsen.

The Spaniard fell at the first hurdle in Paris last year against Cameron Norrie and will hope to avoid a similar fate this time around at the end of a day replete with high-profile departures.