World champion Marlen Reusser (Movistar) won the stage 4 individual time trial at the Tour de Suisse Women, covering the 23.7km course around Aarburg in 29:36, beating Zoe Bäckstedt (Canyon-SRAM) by 11 seconds.

Loes Adegeest (Lidl-Trek) took third place on the stage, 54 seconds down, as the two world champions dominated the flat TT

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“It’s a day that is exceptionally hard, it really is a special course. I think one weak moment can change the whole GC, not only getting me out of the yellow, but for everybody. Tomorrow is going to be super tough.”

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Switzerland's Marlen Reusser wearing the overall leader's yellow jersey celebrates on the podium after winning in the fourth stage, a 23,7 km time trial from Aarburg to Aarburg, at the Women’s Tour of Switzerland (Tour de Suisse) cycling race in Aarburg, Switzerland, on June 20, 2026. (Photo by Fabrice COFFRINI / AFP)

Reusser pulled on the yellow jersey in Aarburg (Image credit: Getty Images)

Brodie Chapman (UAE Team ADQ) was one of the first starters and already set a real benchmark with 30:45. When her compatriot Lauretta Hanson (Lidl-Trek) finished three seconds slower, the Australian could get comfortable in the hot seat as nobody else came close to threatening her time for the next half-hour.

AARBURG, SWITZERLAND - JUNE 20: Zoe Backstedt of Great Britain and Team CANYON//SRAM zondacrypto competes during the 89th Tour de Suisse 2026, Stage 4 a 23.7km individual time trial stage from Aarburg to Aarburg / #UCIWT / on June 20, 2026 in Aarburg, Switzerland. (Photo by Tim de Waele/Getty Images)

Bäckstedt during her effort (Image credit: Getty Images)

Marlen Reusser was five seconds faster than Bäckstedt at the intermediate time, putting the stage victory up in the air, and in front of a home crowd, the world ITT champion finished 11 seconds faster than Bäckstedt to win the stage.