He's also boosted the credibility of the tournament in the locker room, where opinions and perspectives count for a lot. Three times he has come here as world No 5, once as world No 3. That kind of loyalty speaks volumes among his peers.
And his consistency has been outstanding. Ferrer has been to Auckland 10 times and only once failed to make the quarter-finals, in 2010, when he was knocked out in the second round by eventual finalist Arnaud Clement.
Ferrer's first visit was in 2003. Ranked world No 58, he reached the last eight before being knocked out by compatriot Alberto Martins. Ferrer won his first title four years later, beating Gaston Gaudio and Mardy Fish before trumping Tommy Robredo in the final.
Ferrer then enjoyed an astonishing period of dominance between 2011 and 2013, when he was unbeatable on the Auckland hard courts, lifting the trophy three times in a row.
Ferrer's presence is also a huge boost for the tournament, with an unprecedented four players inside the world top 12 (Jo-Wilfried Tsonga 10, John Isner 11, Kevin Anderson 12).
Tsonga arrived on Tuesday and enjoyed a fishing trip to Waiheke on Wednesday. Former champion Philipp Kohlschreiber is also in town, as is 2009 finalist Sam Querrey.
Ferrer in Auckland
2003 - Ranking: 58th - Quarter-final
2006 - Ranking: 14th - Quarter-final
2007 - Ranking: 16th -Champion
2008 - Ranking: 5th - Quarter-final
2009 - Ranking: 12th - Semifinal
2010 - Ranking: 17th - Second round
2011- Ranking: 7th - Champion
2012- Ranking: 5th - Champion
2013 - Ranking: 5th - Champion
2014 - Ranking: 3rd - Semifinal