The Last Six Years of Seeded Players

I went back and looked at the past 6 years worth of majors ('09-'14) and compiled a list of how many times each player was seeded and played.  Only eight players were seeded and played all 24 majors.  Injury is about the only way a top player will miss one and I was surprised how much the 10-25ish players have ebbed and flowed and how many decent players experienced a downturn (perhaps due to injury) that dropped them out of the top 32 for a period of time.

So here are the eight:
Novak Djokovic (SRB)
Roger Federer (SUI)
David Ferrer (ESP)
Tomas Berdych (CZE)
Stan Wawrinka (SUI)
Agnieszka Radwanska (POL)
Jelena Jankovic (SRB)
Caroline Wozniacki (DEN)

And here is everyone else with at least 4 years worth of seeded appearances:

Victoria Azarenka (BLR) 23
Andy Murray (GBR) 23
Samantha Stosur (AUS) 23

Na Li (CHN) 22
Jo-Wilfried Tsonga (FRA) 22
Fernando Verdasco (ESP) 22

Dominika Cibulkova (SVK) 21
Marin Cilic (CRO) 21
Ana Ivanovic (SRB) 21
Anastasia Pavlyuchenkova (RUS) 21
Maria Sharapova (RUS) 21
Serena Williams (USA) 21

Nicolas Almagro (ESP) 20
Svetlana Kuznetsova (RUS) 20
Rafael Nadal (ESP) 20

Marion Bartoli (FRA) 19
Flavia Pennetta (ITA) 19
Nadia Petrova (RUS) 19
Mikhail Youzhny (RUS) 19

Philipp Kohlschreiber (GER) 18
Gilles Simon (FRA) 18

Richard Gasquet (FRA) 17
Petra Kvitova (CZE) 17
Feliciano Lopez (ESP) 17
Lucie Safarova (CZE) 17

Juan Martin Del Potro (ARG) 16
John Isner (USA) 16
Maria Kirilenko (RUS) 16

I am surprised really at how few names are on this list, and there are certainly some mediocre players on here whose consistency must be commended.  If anyone wants the complete compilation I can scan it in and email it to you.

Also, here's a list of the players (one slam wonders if you will) seeded at just one major over the last 6 years, excluding those 9 players seeded for the first time at the most recent US Open:

Iveta Benesova (now Melzer) (CZE)
Alex Bogomolov Jr (USA - at the time)
Jamie Hampton (USA)
Su-Wei Hsieh (TPE)
Martin Klizan (SVK)
Michael Llodra (FRA)
Bethanie Mattek-Sands (USA)
Romina Oprandi (SUI)
Urszula Radwanska (POL)
Laura Robson (GBR)
Sergiy Stakhovsky (UKR)
Ai Sugiyama (JPN)
Tamarine Tanasugarn (THA)