Almagro started sluggishly and almost trailed 3-0 in the opener before finding his range and fighting back to draw level. The two continued to trade blows in an hour-long first under the closed roof at the Ariake Coliseum as a tie-break beckoned. Del Potro saved a set point in the breaker to finally come through and take the opening set.
Though the second stanza resulted in another tie-break, neither player was able to create a break point – both serving well. It was the Argentinean that again proved too hot for his Spanish opponent, changing up his serve to prevail.
The win sees del Potro through to his 22nd tour-level final after completing his 17th victory in 18 matches.