42ac - old toper, found on court;
39dn - the book is half man, half horse;
36ac - dublin brothers from bangor.
Also looking for the Serbian tennis player one!
Sorry,
42ac - old toper found on court (3,5) - presume it's an anagram of old toper - XXX,xOxRx;
46ac - Serbian server at first (3 letters);
39dn - the book is half man, half horse (7 letters) - xxxxAxx.