SPORT::Tennis (SPOS.TNS)
= repeatable match performance (serve/return quality × rally tolerance × shot selection × movement × composure)
  across varying opponents, surfaces, and tournament schedules,
  while keeping shoulder/elbow/wrist + hip/knee/ankle load below injury threshold.
Output is “point reliability” + “match reliability” + “availability”.

P3
- serve and return remain stable under pressure
- rally decision quality holds late in sets
- movement patterns efficient; can defend and transition
- shoulder/elbow robust; low recurrence pain
- mental composure: error recovery is fast
P2
- streaky performance; confidence-driven swings
- serve percentage drops under pressure
- unforced errors rise late; shot selection becomes risky
- recurring elbow/shoulder tightness; small lower-limb niggles
P1
- frequent missed training or matches
- chronic arm pain (tennis elbow/shoulder) or recurring ankle/hip issues
- panic patterns: over-hitting, rushing points
- tactical rigidity; loses same way repeatedly
P0
- significant injury or burnout stops training/competition reliably

Z0 travel/sleep drift + Z1 serve volume spike
→ Z0 shoulder/elbow overload + timing breakdown
→ Z0 unforced errors + double faults rise under pressure
→ Z2 confidence collapse + avoidance behaviors
→ P2 → P1 → P0 (arm injury or mental burnout)
Repair: serve load governance + return-first stability + simplified patterns + recovery discipline.

TIMEFLOW::COURT_DUEL_FUNCTION
T0–T2: elite social contests; skill display + rivalry regulation
T3: codified rules, clubs, standardized courts
T4: professional circuits, national projection, global entertainment
T5: analytics + sensorized training + injury governance + safeguarding for juniors

TNS::Primitives
PR0 Serve mechanics (toss, rhythm, sequencing) + second-serve safety
PR1 Return fundamentals (split step timing, compact swing, target zones)
PR2 Rally tolerance (crosscourt stability, depth control)
PR3 Transition skills (approach + volley + overhead)
PR4 Movement: split step, decel, lateral recovery, open/closed stance patterns
PR5 Shot selection + pattern play (A/B patterns vs opponent types)
PR6 Error recovery routine (reset speed after mistakes)
PR7 Conditioning: repeated points + long matches
PR8 Arm robustness: shoulder cuff/scapular + forearm extensors
PR9 Surface adaptation (hard/clay/grass; if relevant)

Z0::Top Failure Modes (Tennis)
FM0.TN1 serve toss inconsistency → double faults under pressure
FM0.TN2 weak second serve (fear) → passive play
FM0.TN3 return late → defensive scrambling all match
FM0.TN4 “highlight tennis”: low-percentage winners → unforced errors
FM0.TN5 footwork inefficiency → late contact → errors + injury risk
FM0.TN6 elbow pain from over-hitting + poor mechanics
FM0.TN7 shoulder overload from serve volume spikes
FM0.TN8 slow mental reset → error streaks
Z0::Sensor Pack (Minimum viable)
S0.TN1 first-serve % + double fault count
S0.TN2 second-serve “safe target” success (in-play rate)
S0.TN3 return-in-play rate (first 2 shots survival)
S0.TN4 unforced errors by wing (FH/BH/volley)
S0.TN5 arm pain map: elbow/shoulder/wrist (0–10) + next-day stiffness
S0.TN6 movement fatigue: late-to-ball count + decel soreness
S0.TN7 recovery: sleep + mood + appetite (travel sensitive)
Z0::Repairs
R0.TN1 serve-toss micro-block (5–10 min daily)
R0.TN2 second-serve rebuild: spin + high clearance target
R0.TN3 return-first philosophy: compact return, deep middle targets
R0.TN4 pattern simplification: 2 rally patterns only (e.g., cross→cross→change)
R0.TN5 movement drills: split-step timing + decel mechanics
R0.TN6 prehab: cuff/scapular + forearm extensors 2–3×/week
R0.TN7 serve volume cap + gradual ramp
R0.TN8 reset routine: breath + cue + “next point plan”

Z1::Failure Modes
FM1.TN1 training lacks pressure + score context
FM1.TN2 too many drills, not enough point play (or reverse)
FM1.TN3 no opponent-style prep (lefty, pusher, big server)
FM1.TN4 no load governance for serve/overhead volume
FM1.TN5 junior schedules overloaded (too many tournaments)
Z1::Sensors
S1.TN1 drill-to-match transfer: do errors persist in matches?
S1.TN2 pressure performance: tiebreak stats + break-point behavior
S1.TN3 serve/arm pain correlated with serve-volume weeks
S1.TN4 match-to-match variance (streakiness index)
S1.TN5 tactical failure repetition (same pattern loses repeatedly)
Z1::Repairs
R1.TN1 score-based practice (games, tiebreaks, consequence reps)
R1.TN2 ratio rule: stable base drills + decision point play weekly
R1.TN3 opponent modules: 3 plans vs 3 archetypes
R1.TN4 serve load governance + cuff/forearm standards
R1.TN5 tournament budgeting + recovery windows

Z2::Failure Modes
FM2.TN1 early specialization + over-tournamenting → burnout/arm injuries
FM2.TN2 selection bias toward early power; late bloomers lost
FM2.TN3 inadequate S&C + prehab support
FM2.TN4 fragmented support (coach vs physio vs parents)
Z2::Sensors
S2.TN1 tournament density per athlete/season
S2.TN2 arm injury days lost (elbow/shoulder)
S2.TN3 dropout/burnout rate in adolescence
S2.TN4 progression: serve stability + return stability + error-rate decline
Z2::Repairs
R2.TN1 match budget + rest windows + off-season blocks
R2.TN2 movement + strength base standards (injury prevention)
R2.TN3 integrated performance team loop
R2.TN4 parent education: recovery + realistic pathway pacing

Z3::Failure Modes
FM3.TN1 congested scheduling and travel fatigue
FM3.TN2 surface changes too rapid without adaptation time
FM3.TN3 incentives reward playing injured (“points chase”)
Z3::Sensors
S3.TN1 injury incidence around travel clusters
S3.TN2 performance collapses after schedule compression
S3.TN3 medical timeouts + retirement trends
Z3::Repairs
R3.TN1 rest standards between matches + travel buffers
R3.TN2 surface-transition windows and adaptation policies (where possible)
R3.TN3 health-first medical governance + protected withdrawals

STATE::TENNIS
- ServeStability SS = first-serve % + double faults trend
- ReturnStability RS = return-in-play rate
- ErrorLoad EL = unforced errors by wing + streakiness
- MovementQuality MQ = late-to-ball + decel soreness trend
- ArmRisk AR = elbow/shoulder pain trend + serve volume
- PressureReliability PR = tiebreak + break-point behavior
Phase Estimator:
IF SS stable AND RS stable AND AR low AND PR improving → P3 drift
IF AR rising OR EL streakiness rising OR SS drops under pressure → P2/P1 warning
IF repeated time-loss injuries or burnout → P0 risk

1) reduce serve complexity: 1 rhythm, 1 toss target
2) second serve safety rebuild (spin, high margin)
3) pressure reps: serve at 30-40 / break point simulations
4) serve volume cap (avoid overload while rebuilding)
5) match cue: “spin + target” only

1) identify wing + situation (FH late? BH under pace? on the run?)
2) simplify pattern: crosscourt stability first
3) raise margin: aim deeper middle/thirds, reduce line attempts
4) fatigue injection + keep same safe targets
5) reset routine: breath + cue + next-point plan

Trigger: pain trend rising >7 days OR next-day stiffness
1) reduce hitting volume + avoid provocative motions
2) prehab: forearm extensors + cuff/scapular daily micro-dose
3) technique audit (late contact, wristy swings, serve mechanics)
4) gradual return with gates (pain-free, stable mechanics)
5) schedule governance: no sudden volume spikes

CivOS Link:
- Tennis is a “solo accountability” performance OS:
  it trains decision discipline, error recovery, and composure under isolation.
- At Z5: global circuits as projection and commerce networks.
- Brittleness risk: schedule pressure + over-tournamenting juniors → injury/burnout.
- Repair: load governance, safeguarding, medical transparency, and recovery buffers.