World number one Roger Federer came from a set down to outclass Argentine sixth seed David Nalbandian 5-7, 6-2, 6-2 and book his place in the Monte Carlo Masters last four on Friday.
In a tense encounter, Federer converted all his five break chances to improve his personal record against Nalbandian to 9-8 after losing their two previous matches in the Madrid and Paris Masters last year.
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