[14][15] Aduriz showed continuous progress, attested by his nine La Liga goals in 34 games in 2006–07, including a hat-trick against Real Zaragoza on 19 May 2007, albeit in a 3–4 defeat.

[19] On 26 October 2008, Aduriz scored a brace for his new club in a 3–0 home victory over RCD Espanyol,[20] and finished his first year as team top scorer, for a final ninth position.

[24] From January 2011, after the arrival of Brazilian Jonas in the winter transfer window, and due to the fact manager Unai Emery often only played with one pure striker – Roberto Soldado – Aduriz found himself on the bench more often than not.

[28] On 23 August, he scored his first goals in his second spell, netting a brace in a 6–0 home rout of HJK Helsinki in the Europa League playoff round (9–3 on aggregate).

[37] In the last match of the campaign on 23 May, he netted twice in a 4–0 home victory against Villarreal CF to clinch the Zarra Trophy by surpassing Rayo Vallecano's Alberto Bueno, whilst also qualifying for the Europa League.

[38] Aduriz scored a hat-trick as Athletic won 4–0 against Barcelona in the first leg of the Supercopa de España, on 14 August 2015,[39] and equalised in a 1–1 draw in the return match to hand his team the trophy, the first of his career.

[41] Aduriz again proved influential for his team on 5 November, scoring one goal and assisting a further two in a 5–1 defeat of FK Partizan in the Europa League group stage – in the process, he reached the 100-goal mark with the club.

[47] Even though the team was eliminated in the following round by eventual winners Sevilla FC, he finished as the competition's top scorer with ten successful strikes,[48] totalling 36 overall and only trailing Telmo Zarra (47) and Bata (37) for goals during a single season with the club.

[55] Despite the club being eliminated from the 2017–18 Europa League at the last-16 stage, 37-year-old Aduriz finished as the competition's top scorer – along with SS Lazio's Ciro Immobile – with eight goals in the tournament proper.

[56] His 2018–19 campaign was severely curtailed by injuries[57] as the team generally struggled to score and collect points, and he scored only two league goals from 20 appearances; both were penalties in successive home fixtures, the first in a Panenka-style against Girona FC past former teammate Gorka Iraizoz for a last-minute 1–0 victory,[58][59][60] and the second against Valladolid an unusual precise kick with no run-up, described as a "remarkable... five-a-side... minimalist" technique.

[68][69] After an impressive start to his Valencia career, 29-year-old Aduriz earned a first call-up to the Spain national team, being picked for two UEFA Euro 2012 qualifiers in October 2010.

[77] On 12 November 2016, after contributing to a 4–0 victory over Macedonia in the 2018 World Cup qualifying phase in Granada, Aduriz became Spain's oldest ever goal scorer at the age of 35 years and 275 days.