Former world No 1s Caroline Wozniacki and Ana Ivanovic were rarely tested en route to booking their spots in the second round of the Qatar Open in Doha.
Both players safely made it through to the last 32 for the loss of just three games apiece, as Wozniacki beat Bosnian Mervana Jugic-Salkic 6-1 6-2, while Ivanovic trounced Tamira Paszek of Austria by the same scoreline.
The pair were the only seeds in action on day one of a tournament that can boast 13 of the world's top 14 players.
Wozniacki's only moment of concern came in the opening game of the contest in which she was broken to 30 before the Dane won the next nine to cruise across the finishing line in 61 minutes.
Ivanovic was on court slightly longer, with the Serbian sealing victory on her fourth match point.
Wozniacki said: "It's tough to play a first match and tough to play an opponent you haven't played before.
"I felt like I served well, returned well. I was happy."
Ivanovic added: "I actually expected a very tough match. We've had some battles in the past but I really started well and I was aggressive.
"I definitely feel my game is coming to the point where I can challenge these top players.
"That's exciting because if it wasn't like that I wouldn't be here. I really want to get myself in a position to play against these top players, because only playing them time and time again can you can break through eventually and finally win."
Top seed Victoria Azarenka will lose top spot in the world ranking if Serena Williams wins three matches in the tournament.
The No 3 seed Maria Sharapova could also reach the top of the rankings this week - but only if Serena fails to reach the semi-final and Azarenka misses out on the final.
The only player from the top 14 not taking part this week is world No 5 Li Na who is yet to recover from the ankle injury sustained during the Australian Open last month.