Egan Bernal crashed out of contention in the closing stages of Clasica San Sebastian and has been taken to hospital for checks.
He will be assessed by maxillofacial specialists and will be staying overnight for observation and further treatment.
1. Julian Alaphilippe (Quick-Step Floors) 6:03:45
2. Bauke Mollema (Trek-Segafredo) s.t.
3. Anthony Roux (Groupama-FDJ) +16"
4. Greg Van Avermaet (BMC Racing) s.t.
5. Julien Simon (Cofidis)
26. Jonathan Castroviejo (Team Sky) +1:13"
Lukasz Wisniowski was the first Team Sky rider home in Krakow in 20th, and without the recognised sprinter in the squad the team were able to keep their powder dry ahead of more selective stages to come.
GC duo Michal Kwiatkowski and Sergio Henao finished safely in the peloton, with Pascal Ackermann (Bora-Hansgrohe) taking the victory.