* Kehl winner gives Dortmund 2-1 victory at Schalke
* Bayern Munich held 0-0 at home by Mainz
(Adds Bayern draw, quotes)
BERLIN, April 14 (Reuters) – Bundesliga leaders Borussia
Dortmund, who triumphed 1-0 against title rivals Bayern Munich
in midweek, completed a perfect four-day spell by winning 2-1 at
third-placed Schalke 04 on Saturday.
As an added bonus Bayern were later held to a goalless draw
at home by mid-table Mainz, leaving champions Dortmund eight
points clear at the top and needing only two points from their
final three games to retain the title.
Jefferson Farfan gave Schalke an early lead in the Ruhr
derby but Lukasz Piszczek equalised in the 17th minute of a
physical, unattractive game which eventually left the visitors
with one hand on the championship trophy.
Sebastian Kehl took advantage of poor defending to score the
winner in the 63rd minute as Dortmund completed the Bundesliga
double over Schalke and extended their unbeaten league run to 25
games, a record for a single season.
