Craig Breen leads Tanak after lively first day in Sweden
Breen, who is returning to the championship with a part-time drive, trailed Tanak through the morning stages but hit the front in the afternoon and then kept the Estonian at bay as darkness fell.
"It’s definitely been one of my strongest days," said the Irish driver."Last year I was usually upside down or stuck in a hedge somewhere, so it's music to my ears to be in the lead tonight."
Finland's Esapekka Lappi (32) was in third place for Hyundai with Welshman Elfyn Evans (34) fourth for Toyota in the second round of the season after the Monte Carlo opener.
Toyota's reigning champion Finn Kalle Rovanpera (22) was in fifth place after opening the road for others and conditions favouring the later runners.