Home favourite Marin Cilic can win a fourth Zagreb Indoors title when the tournament gets under way in Croatia on Monday.
The world number 37 suffered a disappointing Australian Open campaign, bowing out to Gilles Simon in the second round, but will return to his native Croatia eyeing a fourth win in six years at the ATP 250 Series event.
Cilic, a winner in 2009, 2010 and 2013, clinched the title last year with a 6-3 6-1 victory over Jurgen Melzer and will begin his defence against compatriot Mate Delic - a 20-year-old wildcard.
The number five seed has the chance to overtake coach and former world number two Goran Ivanisevic in terms of ATP titles won in Croatia with victory in Zagreb, after Ivanisevic picked up four winner's medals in his homeland.
"Goran is an excellent coach. He passes everything he knows on to me. We have had super preparations and my inner feeling is that I play better than before. All I have to do now is demonstrate this in the matches," Cilic told the tournament's official website.
"(Ivanisevic's record) will not be an additional motive for me. Naturally, it would be nice to raise the winner's trophy again. But, our main goal in this season is to achieve the best possible results at Grand Slam tournaments and at ATP Masters Series."
World number 12 Tommy Haas will make his debut in Zagreb as top seed, having recovered from the shoulder injury that forced him to retire during his first-round clash with Guillermo Garcia-Lopez at the Australian Open.
Mikhail Youzhny and Ivan Dodig, both former winners of the competition, are seeded second and fourth respectively, although two of the world's top 20 have been ruled out due to injury.
Croatian Milos Raonic, number 11 in the world, misses out with an ankle complaint, while Grigor Dimitrov cited his need for rest and recovery as his reason for withdrawal, having suffered a recurring leg injury.
Dimitrov, who reached his first grand slam quarter-final in Melbourne, explained his decision, as he said: "I am very disappointed that I won't be able to compete at PBZ Zagreb Indoors this year.
"The accumulations of matches in Australia and a leg injury makes necessary to give my body a rest to recover."
|Millwall 0 Bolton Wanderers 1: Pratley nets winner for visitors|
|Carter receives all clear|
|Lens 2 Nice 0: Cyprien and Coulibaly lift hosts|
|Celta Vigo 0 Almeria 1: Nolito miss proves costly|
|Heerenveen 0 ADO Den Haag 0: Visitors´ winless streak extended|
|Mainz 1 Bayern Munich 2: Guardiola´s men break Christmas points record|
|Blanc unconcerned by league placing|
|United targeting title - Carrick|
|Soldado ´ashamed´ at not performing for Spurs|
|Ramos to wait and see on fitness for final|
|Henry haul seals series for New Zealand|
|Under-fire Cook´s ODI reign in the balance|
|Phelps given suspended sentence for DUI|
|Garcia wins appeal against two-match ban|
|Hart signs new City contract|
|Hereford United wound up|
|Pearson given touchline ban for fan row|
|South Africa canter towards victory|
|Vergne joins Ferrari as test driver|
|FIFA confirms third-party ownership ban|
|Ajmal returns to cricket|
|Inter v Lazio: Ranocchia wants to build momentum|
|Rodgers hits out at Sterling criticism|
|Pardew backs Colback to shine against Sunderland|
|Minimal recovery time a concern for Bauza|
|Liverpool v Arsenal: Wenger out to avoid repeat performance|
|Newcastle United v Sunderland: Pardew calls for a derby day show|
|Adebayor available for Burnley clash|
|Smith salutes Australia´s strength in depth|
|Athletic Bilbao v Atletico Madrid: Simeone´s men eye fitting response|
|Nadal determined to make strong comeback in Melbourne|
|Targett commits to Southampton|
|Garcia vows to attack Milan|
|City still without strike trio for Palace test|
|Courtois set for return at Stoke|
|Di Maria set for possible United return at Villa|
|Neymar in frame for Cordoba match|
|FIFA to publish Garcia report|
|Liverpool will not appeal Balotelli ban|
|A-League: Newcastle Jets 2 Adelaide United 1|
|Fournier eyes Fekir stay and attacking reinforcements|
|Abidal announces retirement ahead of potential Barca return|
|Redknapp: Crouch deal not possible|
|Saracens lead calls to scrap Premiership salary cap|
|Klaassen laments Ajax ´off-day´|
|Wenger not fearful of another Anfield nightmare|
|Whelan wants to extend Stoke stay|
|Kalou eyes Hertha exit|
|Fellaini: Belief growing of title tilt at United|
|Benteke: Villa transfer request was a mistake|
|Gerrard urges Sterling to stay put|
|Another Smith century ensures Australia dominate on day three|
|Pardew calls for calm ahead of derby clash|
|Ducks dash clear in Pacific, Panthers pip Flyers in shoot-out|
|Curry leads Warriors, Butler stars in Rose´s absence|
|Johnson wins rugby league´s Golden Boot|
|Kerala Blasters v Atletico de Kolkata: Luis Garcia talks up team ahead of final|
|Titans close on top pick after loss to Jaguars|
|Dallas deal for Rondo, Celtics net trio|
|Monk wants three new Swansea signings|
|Koeman plays down Sneijder link|
|Howard targets another World Cup|
|Inzaghi prepared for Stadio Olimpico atmosphere|
|Toronto expect Defoe to return|
|Bears quarterback Cutler wants to stay in Chicago|
|Harbaugh tight-lipped on Michigan rumours|
|Khan slams ´silly´ Mayweather|
|Rodriguez suffers injury setback|
|Warriors centre Bogut out indefinitely|
|Klopp denies Dortmund departure plans|