Top-20 players Juan Monaco and Alexandr Dolgopolov have both confirmed their participation in September's Malaysian Open.
Argentinian Monaco has recently reached the top ten in the world rankings for the first time, after securing three ATP Tour titles so far this year.
The 28-year-old has enjoyed the best year of his career and will hopeful of making a big impact at the ATP World Tour 250 tournament.
Clay-court specialist Monaco, a six-time winner on Tour, will aim to upset the tennis odds on hist first appearance on the indoor hard courts in Kuala Lumpur.
Meanwhile, world number 17 Dolgopolov will return to Malaysia to join a strong field for the tournament - which gets underway on September 22.
The Ukrainian is still looking for his first Tour title of 2012, having been beaten by Andy Murray in the final in Brisbane early in the year.
Dolgopolov, who is likely to feature heavily in US Open betting, revealed: "I have fond memories of my last visit to Kuala Lumpur. My coach Jack and I felt very comfortable and welcome in Malaysia and we are excited to return and play the highest quality tennis."
The field in Malaysia is headed by David Ferrer, with the world number five likely to start as the favourite for the men's singles title.
Rising Japanese star Kei Nishikori is another top player taking part in Kuala Lumpur, with the 22-year-old up to 18 in the world rankings.
There have been three different winners of the event in the last three years, with all three victors coming from Europe.
Nikolay Davydenko (2009) and Mikhail Youzhny (2010) claimed back-to-back Russian victories, before Serbia's Janko Tipsarevic took the title in 2011, with a straight sets win over Marcos Baghdatis.