Looking back over the junior world rankings of 2015 one notes that No. 2 Vondrousova and No.4 Andreescu have both reached Grand Slam singles finals in 2019. Unfortunately from a British point of view No. 3 Katie Swan doesn't look like she will emulate them. One should also add that soon after Paris Vondrousova suffered a wrist problem and has only won 1 match since Paris.
Looking back over the junior world rankings of 2015 one notes that No. 2 Vondrousova and No.4 Andreescu have both reached Grand Slam singles finals in 2019. Unfortunately from a British point of view No. 3 Katie Swan doesn't look like she will emulate them. One should also add that soon after Paris Vondrousova suffered a wrist problem and has only won 1 match since Paris.
It was another player who hasn't made it yet. The player is Dalma Galfi of Hungary who has played against both Heather and Katie B in the Fed Cup.
Also, I see that in the coming week's WTA International in Nanchang, China, Emily WS is playing Xu Shilin in QR1.
Born 1998, now 21, that's another former junior #1 from about the same time that is still far from the senior upper echelons. Currently WR 215, her CH is 190 from May this year.
There will no doubt be a huge range of senior outcomes for top junior ranked players. I don't know if anyone has done stats on say top 5 or 10 ranked juniors.
The problem with junior rankings is the bottle-neck problem.
Each year (or max, each two years, say) there is a completely new batch of top 10 or top 20 (or top whatever) junior players.
But the adult rankings do not turn over in the same way. Indeed, as per the men, once they're there, they're there to stay, it seems. Being top 20 from age 22 to 35, say, is quite possible.
So you've got approx 8-10 times the number of top juniors as can ever possibly be accommodated in the top adults.
And that's not even counting the non-top 20 juniors who also make it.
So there simply HAS to be a lot who don't transition - there just isn't room.
Also, I see that in the coming week's WTA International in Nanchang, China, Emily WS is playing Xu Shilin in QR1.
Born 1998, now 21, that's another former junior #1 from about the same time that is still far from the senior upper echelons. Currently WR 215, her CH is 190 from May this year.
There will no doubt be a huge range of senior outcomes for top junior ranked players. I don't know if anyone has done stats on say top 5 or 10 ranked juniors.
I had a look at the top 5 juniors from 2010 onwards and up to 2015 most of the top 5 have made the top 100 at some stage.
2010 was 1. Gavrilova 2. Svitolina 3 L. Davis 4. Puig Briefly 5. Khromacheva.
2012 was 1. Townsend 2. Siniakova 3. Bouchard 4. Konjuh (later serious elbow problems) Not top 100 Lottner
2013 was 1. Bencic 2. Konjuh 5. Jorovic Not top 100 3. Flink 5 . Krejcikova (but successful doubles player)
2014 was 1. Bellis(another injury spoilt career) 4. Teichman 5. Kasatkina Not top 100 2. Shilin Xu 3. Shymanovich
2015 was 2. Vondrousova 4. Andreescu 5. Blinkova Not top 100 1. Galfi 3. Swan
2016 maybe not too late for some but was 1. Potapova 5. Anisimova
2017 maybe too soon for some but 3. Rybakina
2018 2. Cori Gauff
Unfortunately from a British point of view Katie Swan is amongst those who have not made the top 100 even if she did enjoy the support of the Murray family. Injury seems to have done for both Bellis and Konjuh.
It would also be interesting to see who benefited most from wildcards to help fast track their development. The bigger the tennis nation, the more you'd expect, but some will have worked their way up the rankings the harder way.
As an aside to successful juniors becoming successful adult players here is another question? Does anybody know who subsequently has had the most successful singles career of the 64 girls who took part in junior Wimbledon 2008 which Laura Robson won? As a clue it will not require going through the record of the 64 players concerned as they were a late developer and have had a big impact in 2019.
Serena hasn't won any finals since beating Venus in the 2017 Aussie final. The last final she won before that was Wimbledon 2016 beating Angie Kerber in the final. Time catches up with everybody in the end.
Respect to Serena for the way she started striking the ball and came back in that second set. But then at the conclusion of that set she once again couldn't get the job done. And it is only likely to get more difficult for her.