Question: Did Kevin Curren or Ivan Dodig have a higher singles ranking?

Context paragraphs:
2017 Rogers Cup – Men's Doubles: Ivan Dodig and Marcelo Melo were the defending champions, but chose not to participate together.  Melo played alongside Łukasz Kubot, but lost in the second round to Fabrice Martin and Édouard Roger-Vasselin.  Dodig teamed up with Rohan Bopanna, but lost in the final to Pierre-Hugues Herbert and Nicolas Mahut, 4–6, 6–3, [6–10].

2015 Brest Challenger – Singles: This was the first edition of the tournament, Ivan Dodig won the title beating Benoît Paire in the final 7–5, 6–1.

2017 Western &amp; Southern Open – Men's Doubles: Ivan Dodig and Marcelo Melo were the defending champions, but chose not to participate together.  Dodig teamed up with Rohan Bopanna, but lost in the quarterfinals to Melo who partnered Łukasz Kubot.  Kubot and Melo lost in the semifinals to Jamie Murray and Bruno Soares.

2009 Zagreb Open – Doubles: Ivan Dodig and Júlio Silva were the defending champions, however only Dodig chose to play this year.  He competed with Lovro Zovko.  They lost to Brian Dabul and Leonardo Mayer in the first round.

Ivan Dodig: Ivan Dodig (born 2 January 1985) is a Croatian tennis player.  His career-high ATP rankings are world No. 29 in singles and world No. 4 in doubles.  Dodig is a Grand Slam champion after winning the 2015 French Open men's doubles title with Marcelo Melo.

Kevin Curren: Kevin Melvyn Curren (born 2 March 1958) is a South African-American former professional tennis player.  He played in two Grand Slam singles finals and won four Grand Slam doubles titles, reaching a career-high singles ranking of World No. 5.

2016 BNP Paribas Masters – Doubles: Ivan Dodig and Marcelo Melo were the defending champions, but Dodig chose not to participate this year.  Melo played alongside Vasek Pospisil, but lost to John Peers and Henri Kontinen in the semifinals.

2011 Alessandria Challenger – Doubles: Ivan Dodig and Lovro Zovko were the defending champions but Dodig not to participate. <br>

2017 ABN AMRO World Tennis Tournament – Doubles: Nicolas Mahut and Vasek Pospisil were the defending champions, but Pospisil chose not to participate this year.  Mahut played alongside Pierre-Hugues Herbert, but lost in the semifinals to Ivan Dodig and Marcel Granollers.

2010 Tennislife Cup – Doubles: Frederico Gil and Ivan Dodig were the defending champions, but Dodig decided not to participate.

Supporting paragraphs: Kevin Curren Ivan Dodig
Answer: Kevin Melvyn Curren