WATCH: Rune improved to 12-2 since the US Open and scored a seventh straight match win in Basel over Ugo Humbert.

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The cold never bothered him anyway: not even a trip to the cryo chamber can cool off an on-fire Holger Rune at the Swiss Indoors Basel.

The Danish teenager shared the extreme lengths necessary to maximize his recovery and maintain a seven-match winning streak that has already earned him a second career title in Stockholm.

In the absence of ice baths in Basel, Rune has resorted to the cryo chamber’s -210 degree temperatures for an interminable three minutes.

The chill appear to be working as Rune, who added Patrick Mouratoglou to his team earlier this month, heads into his fourth straight quarterfinal—putting the 19-year-old in contention for a Top 20 debut ahead of a second ATP Next Gen Finals berth.

All that tennis has put a premium on recovery, with Rune happily boasting of a strong nine-hour sleep before he plays an in-form Arthur Rinderknech.

“Batteries recharged ✔️ and on court for warm up,” he tweets with a steel flex emoji. “See you tonight for the QF.”