Top seeds Leander Paes and Lukas Dlouhy entered the semi-finals with a 6-2, 7-6 (4) win over Alexander Peya and Philipp Petzschner at the Tokyo Open on Friday.
- Del Potro knocks out top seed Ferrer
The Indo-Czech pair are on track for back-to-back titles after they won the Thailand Open last week.
Paes-Dlouhy will face Robert Kendrick of USA and Finn Jarkko Nieminen in the semi-final.
Third seeds Jordan Kerr-Robert Lindstedt and Mikhail Youzhny- Mischa Zverev will contest the other semis.
Youzhny-Zverev overcame second seeds Simon Aspelin and Julian Knowle in the match tie-break to enter the last four.
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