Who were the most expensive players in the past IPL auctions?

Australian fast bowler Pat Cummins was IPL 2020 auction's most expensive buy after being bought by KKR for ₹15.5 crore. MS Dhoni was the most expensive buy in first-ever IPL auction, bought by CSK for $1.5 million. In 2015, DD bought Yuvraj Singh for ₹16 crore, making him the most expensive buy of IPL ever.