Top seed Roger Federer reached the final of the Gerry Weber Open in Halle with a 6-1 6-4 win over Nicolas Kiefer.

The unseeded Kiefer was the last man to beat Federer at the event in the 2002 semis, but he was swept in just over an hour by the Swiss world number one.

Federer has now served 39 times without being broken at this year's tournament, and has extended his winning streak on grass to 48 matches.

Federer will meet James Blake or Philipp Kohlschreiber in the final.