Poland's Marceli Bogusławski, riding for the national team, was the highest-placed home rider, finishing 27th.
Milan now leads the general classification by 18 seconds over France's Paul Magnier, who finished runner-up on each of the first two stages.
Hobbs is third overall, 20 seconds behind Milan.
Poland's Kamil Małecki of Q36.5 Pro Cycling Team is fourth overall, trailing Milan by 22 seconds.
Wednesday's stage marked the final opportunity for the sprinters before the race heads into the mountains.
Stage four on Thursday runs from Żagań to the mountain resort of Karpacz, where the climbers are expected to come to the fore.
The 83rd annual Tour de Pologne began on Monday in the northern port city of Gdynia and ends on Sunday with a 12.4-kilometre individual time trial in the southern town of Wieliczka.
The seven-stage race takes riders from Poland's Baltic coast to the Tatra Mountains, with the overall winner likely to be decided in the final time trial.
American Brandon McNulty won last year's Tour de Pologne after taking victory in the concluding time trial in Wieliczka.