With victories in Kuusamo and Lillehammer, the German headed to Austria full of confidence of making it a hat-trick of wins, and duly delivered, winning by 5.3seconds in a time of 21:52.40minutes.
He did not have things all his own way however, lying seven seconds back in third after the ski jumping round behind Haavard Klemetsen, who jumped 96.5metres, while German youngster Tobias Haug impressed in second.
But Frenzel pulled away on the skis on the final lap with Norway's Klemetsen holding on for silver ahead of compatriot Mikko Kokslien in third.
It was enough to move Kokslien up to third in the overall rankings after reigning Olympic champion Jason Lamy Chappuis, who recorded a poor jump down in 35th place, could only manage a 22nd place finish.
Japan's Akito Watabe, who finished fifth, is second on 221 points but it is Frenzel who is setting the pace, out in front by a further 105 points.