Pilic today booked his spot in the quarter-finals of both the men's singles and men's doubles, having already qualified for the same round in the mixed doubles.

Following a 12-7, 12-3 win with Dennis Correia against Moldovans Valentin Furdui and Valeriu Tiron, Pilic spoke to insidethegames about his World Championships so far and how he continues to rack up victories, despite the busy schedule.

So far Pilic has played 12 matches in two days, with three more guaranteed tomorrow.

"Sometimes when I'm training I just do reps, sometimes I just play all day, sometimes I play for four hours and play singles, doubles and mixed doubles," Pilic said.

"It works on my stamina, so when I come here and play in tournaments I don't get tired playing three events."

Pilic said his longest period of time playing non-stop is five hours and those marathon sessions have helped his endurance at the World Championships here in Polish city Gliwice.

"At the end of that you get really tired but you know that that's going to help you out eventually in tournaments," Pilic added.

"One of the most important things is dividing up training between all three categories.

"Training singles is about knowing how to do a right and left foot smash and head smash.

"I like to make my training a lot of repetitions so I can get really consistent at the skills that I need the most.

"The mixed and the men's doubles are slightly different, so you have to adjust how you go into each event, so maybe one event you're not able to attack as well and you need to play a little more safe; and others if you don't go out and attack, the other team is going to go out and attack.

"The level of play is going to be a lot higher than the group stage, but I don't want to really adjust anything from the group stages, just play my normal game that got me here."

One of the players Pilic could facing several times in the tournament is men's singles world number one Apor Györgydeák.

The Romanian is also into the final eight in all three categories.

Györgydeák credited mental and stretching training with helps him to be efficient in his movement and therefore less tired during the day.

"My form is very good, I train twice a day every day," Györgydeák told insidethegames.

"I've been playing football for 15 years and that gave me my pace and helped me to be good in practice."