French Open Day 1: Federer, Halep, Ivanovic, Nishikori, Wawrinka among seeds advancing

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Action's underway in Paris on Day 1, and here's what you need to know:

Men's Seeds Advancing

No. 2 Roger Federer defeats Alejandro Falla 6-3, 6-3, 6-4
No. 5 Kei Nishikori defeats Paul-Henri Mathieu 6-3, 7-5, 6-1
No. 8 Stan Wawrinka defeats Marsel Ilhan 6-3, 6-2, 6-3
No. 14 Jo-Wilfried Tsonga defeats Christian Lindell 6-1, 6-2, 6-2
No. 19 Roberto Bautista Agut defeats Florian Mayer 6-3, 6-1, 6-3
No. 22 Philipp Kohlschreiber defeats Go Soeda 6-1, 6-0, 6-2
No. 24 Ernests Gulbis defeats Igor Sijsling 6-4, 6-4, 7-6

Notes: Federer was approached on court by a young fan seeking a selfie after his match, and was clearly annoyed by yet another instance of lax security at Roland Garros. ... Federer had different feelings about his straight-sets victory: "I love coming here," he said. "I wasn't broken. I'm happy." ... Eleven of 13 matches completed as of 8:40 a.m. ET ended in straight sets.

Men's Seeds Upset

Marcos Baghdatis defeats No. 25 Ivo Karlovic 7-6, 6-4, 6-4
Steve Johnson defeats No. 26 Guillermo Garcia Lopez 6-3, 6-3, 6-7, 3-6, 6-3

Women's Seeds Advancing

No. 3 Simona Halep defeats Evgeniya Rodina 7-5, 6-4
No. 7 Ana Ivanovic defeats Yaroslava Shvedova 4-6, 6-2, 6-0
No. 9 Ekaterina Makarova defeats Louisa Chirico 6-4, 6-2
No. 13 Lucie Safarova defeats Anastasia Pavlyuchenkova 7-6, 7-6
No. 21 Garbine Muguruza defeats Petra Martic 6-2, 7-5
No. 28 Flavia Pennetta defeats Magda Linette 6-3, 5-7, 6-1

Notes: "I have stronger body and I have improved a lot in my game," Halep said after her match. "Serve is better, so I feel more confident now with my game."

Women's Seeds Upset

Polona Hercog defeats No. 24 Shuai Peng 6-0, 2-0 (Ret.)
Donna Vekic defeats No. 31 Caroline Garcia 3-6, 6-3, 6-2